Databases: Most Popular Articles
These articles are the most popular over the last month.
Database Normalization Basics
Database normalization can save storage space and ensure the consistency of your data. Learn the basics in this introductory article.
Database normalization can save storage space and ensure the consistency of your data. Learn the basics in this introductory article.
SQL Server Stored Procedures
Microsoft SQL Server provides the stored procedure mechanism to simplify the database development process by grouping Transact-SQL statements into manageable blocks.
Microsoft SQL Server provides the stored procedure mechanism to simplify the database development process by grouping Transact-SQL statements into manageable blocks.
Entity-Relationship Diagram
What is a database? Find out here!
What is a database? Find out here!
Primary Key
What is a primary key? Find out here!
What is a primary key? Find out here!
Microsoft Access Fundamentals
Want to learn how to use Microsoft Access? Find out on the About.com Databases site!
Want to learn how to use Microsoft Access? Find out on the About.com Databases site!
Creating Forms in Access
Learn how to create a simple form in Microsoft Access. This tutorial walks you through the process step-by-step!
Learn how to create a simple form in Microsoft Access. This tutorial walks you through the process step-by-step!
First Normal Form
In this article, we begin our look at the first of three major normal forms -- first normal form (otherwise known as 1NF).
In this article, we begin our look at the first of three major normal forms -- first normal form (otherwise known as 1NF).
Creating a Simple Query in Microsoft Access
Want to learn how to create a query in Microsoft Access? Find out on the About.com Databases site!
Want to learn how to create a query in Microsoft Access? Find out on the About.com Databases site!
Converting Excel to Access
Are you ready to convert your unwieldy Excel spreadsheet to a flexible Access database? Let us walk you through the process!
Are you ready to convert your unwieldy Excel spreadsheet to a flexible Access database? Let us walk you through the process!
What is a Database?
Databases are designed to offer an organized mechanism for storing, managing and retrieving information. They do so through the use of tables. If you’re familiar with spreadsheets like Microsoft Excel, you’re probably already accustomed to storing data in tabular form. It’s not much of a stretch to make the leap from spreadsheets to databases.
Databases are designed to offer an organized mechanism for storing, managing and retrieving information. They do so through the use of tables. If you’re familiar with spreadsheets like Microsoft Excel, you’re probably already accustomed to storing data in tabular form. It’s not much of a stretch to make the leap from spreadsheets to databases.
Microsoft Access Reports Tutorial
Would you like to create professional-looking reports from your Microsoft Access database with the click of a mouse? Follow along as we walk through the simple process of designing a reusable report.
Would you like to create professional-looking reports from your Microsoft Access database with the click of a mouse? Follow along as we walk through the simple process of designing a reusable report.
Introduction to SQL
Would you like to learn SQL? This tutorial will introduce you to the basics.
Would you like to learn SQL? This tutorial will introduce you to the basics.
Building an Access Database...
In this series of Microsoft Access tutorials, we follow the database administrators for Patrick's Widgets as they build a Microsoft Access database from the ground up.
In this series of Microsoft Access tutorials, we follow the database administrators for Patrick's Widgets as they build a Microsoft Access database from the ground up.
Third Normal Form (3NF)
In our first article, we looked at the basic requirements of 3NF. Here they are again to refresh your memory: meet the requirements of 1NF and 2NF and remove columns that are not fully dependent upon the primary key.
In our first article, we looked at the basic requirements of 3NF. Here they are again to refresh your memory: meet the requirements of 1NF and 2NF and remove columns that are not fully dependent upon the primary key.
Database Software Options
You've finally buckled down and decided that it's time to purchase a database solution for your home or business. What type of database do you need? It's actually a simple matter of deciding what features you need and choosing a product that meets your requirements and doesn't cause too much pain in your pocketbook.
You've finally buckled down and decided that it's time to purchase a database solution for your home or business. What type of database do you need? It's actually a simple matter of deciding what features you need and choosing a product that meets your requirements and doesn't cause too much pain in your pocketbook.
Second Normal Form
Second Normal Form allows you to enhance the normalization of your database. In this article, we explore the requirements of 2NF and the process of normalizing your database.
Second Normal Form allows you to enhance the normalization of your database. In this article, we explore the requirements of 2NF and the process of normalizing your database.
Summarizing Data with CUBE and ROLLUP
SQL's CUBE and ROLLUP commands allow for the efficient summarization of data. Learn how to use them here!
SQL's CUBE and ROLLUP commands allow for the efficient summarization of data. Learn how to use them here!
Creating Database Relationships in Access
Join us as we walk through the process of creating database relationships in Microsoft Access.
Join us as we walk through the process of creating database relationships in Microsoft Access.
Databases for Beginners
Are you new to the world of databases? Wondering where to get started? In this series of articles, we introduce you to the basics of database technology and help you get started in this exciting field.
Are you new to the world of databases? Wondering where to get started? In this series of articles, we introduce you to the basics of database technology and help you get started in this exciting field.
Databases Glossary
Glossary of database related terms from your About.com Guide to Databases
Glossary of database related terms from your About.com Guide to Databases
Aggregate Functions in SQL
Summarize data with SQL's SUM, AVG, MIN, MAX and COUNT functions. Your About.com Guide to Databases walks you through the process.
Summarize data with SQL's SUM, AVG, MIN, MAX and COUNT functions. Your About.com Guide to Databases walks you through the process.
Self-Joins in SQL
You can use a self-join to simplify nested SQL queries where the inner and outer queries reference the same table. These joins allow you to retrieve related records from the same table.
You can use a self-join to simplify nested SQL queries where the inner and outer queries reference the same table. These joins allow you to retrieve related records from the same table.
Database Keys
As you may already know, databases use tables to organize information. Each table consists of a number of rows, each of which corresponds to a single database record. So, how do databases keep all of these records straight? It’s through the use of keys.
As you may already know, databases use tables to organize information. Each table consists of a number of rows, each of which corresponds to a single database record. So, how do databases keep all of these records straight? It’s through the use of keys.
Retrieving Data from Multiple Tables with SQL Joins
SQL joins allow you to retrieve data from multiple database tables. Your About.com Guide to Databases provides a comprehensive introduction.
SQL joins allow you to retrieve data from multiple database tables. Your About.com Guide to Databases provides a comprehensive introduction.
Referential Integrity
What is Referential Integrity? Find out in our database glossary!
What is Referential Integrity? Find out in our database glossary!
Exporting Access Tables to ...
Microsoft Access allows you to export data to a variety of formats for sharing and analysis. In this tutorial, we walk through the process of exporting an Access table to an Excel workbook.
Microsoft Access allows you to export data to a variety of formats for sharing and analysis. In this tutorial, we walk through the process of exporting an Access table to an Excel workbook.
Joining Multiple Tables in SQL
You can use SQL JOIN statements to combine data from three or more tables. In an earlier article, we took a look at using inner joins and outer joins to combine data from two different tables. In many cases, you’ll want to take this a step further and combine data from three or more tables. Let's take a look at the SQL statements that allow you to accomplish this goal for an inner join.
You can use SQL JOIN statements to combine data from three or more tables. In an earlier article, we took a look at using inner joins and outer joins to combine data from two different tables. In many cases, you’ll want to take this a step further and combine data from three or more tables. Let's take a look at the SQL statements that allow you to accomplish this goal for an inner join.
Creating Databases and Tables
Learn to create databases and tables using the Structured Query Language (SQL) in this step-by-step tutorial from your About.com Guide to Databases.
Learn to create databases and tables using the Structured Query Language (SQL) in this step-by-step tutorial from your About.com Guide to Databases.
ZIP Code Database
This free Access database of ZIP codes provides database designers with a valuable tool to assist in mapping ZIP codes to a city/state pair and even provides the latitude and longitude of that location.
This free Access database of ZIP codes provides database designers with a valuable tool to assist in mapping ZIP codes to a city/state pair and even provides the latitude and longitude of that location.
Deleting Data from an SQL Table
The SQL DELETE command allows the removal of some or all of the data stored in a relational database table.
The SQL DELETE command allows the removal of some or all of the data stored in a relational database table.
Data Mining: An Introduction
Data mining allows you to find the needles hidden in your haystacks of data. Learn how to use these advanced techniques to meet your business objectives.
Data mining allows you to find the needles hidden in your haystacks of data. Learn how to use these advanced techniques to meet your business objectives.
Dynamic Web Pages With Access
Want to create dynamic, server-generated HTML from your Access database? This step-by-step tutorial will walk you through the process.
Want to create dynamic, server-generated HTML from your Access database? This step-by-step tutorial will walk you through the process.
Creating Forms in Access 2007
Although Access provides a convenient spreadsheet-style datasheet view for entering data, it isn’t always an appropriate tool for every data entry situation. If you’re working with users you don’t want to expose to the inner workings of Access, you may choose to use Access forms to create a more user-friendly experience. In this tutorial, we’ll walk through the process of creating an Access form.
Although Access provides a convenient spreadsheet-style datasheet view for entering data, it isn’t always an appropriate tool for every data entry situation. If you’re working with users you don’t want to expose to the inner workings of Access, you may choose to use Access forms to create a more user-friendly experience. In this tutorial, we’ll walk through the process of creating an Access form.
Using Self-Joins in SQL
Did you know that you can use a self-join to simplify nested SQL queries where the inner and outer queries reference the same table? Let's take a look at an example.
Did you know that you can use a self-join to simplify nested SQL queries where the inner and outer queries reference the same table? Let's take a look at an example.
Stored Procedure vs. Function
SQL Server user-defined functions and stored procedures offer similar functionality. Both allow you to create bundles of SQL statements that are stored on the server for future use. This offers you a tremendous efficiency benefit, as you can save programming time by...
SQL Server user-defined functions and stored procedures offer similar functionality. Both allow you to create bundles of SQL statements that are stored on the server for future use. This offers you a tremendous efficiency benefit, as you can save programming time by...
Foreign Key
What is a foreign key? Find out here!
What is a foreign key? Find out here!
Database Beginners FAQ
Just getting started with databases? Here's a rundown of the top things that I wish I knew before I got started in the field. These facts are guaranteed to make your life easier!
Just getting started with databases? Here's a rundown of the top things that I wish I knew before I got started in the field. These facts are guaranteed to make your life easier!
Access 2007 Relationships
The true power of relational databases lies in their ability to track relationships (hence the name!) between data elements. However, many database users don’t understand how to take advantage of this functionality and simply use Access as an advanced spreadsheet. In this tutorial, we’ll walk through the process of creating a relationship between two tables in an Access database.
The true power of relational databases lies in their ability to track relationships (hence the name!) between data elements. However, many database users don’t understand how to take advantage of this functionality and simply use Access as an advanced spreadsheet. In this tutorial, we’ll walk through the process of creating a relationship between two tables in an Access database.
Boyce-Codd Normal Form (BCNF)
What is Boyce-Codd Normal Form (BCNF)? Find out here!
What is Boyce-Codd Normal Form (BCNF)? Find out here!
Choosing a Database
Database management systems (or DBMSs) can be divided into two categories -- desktop databases and server databases. Generally speaking, desktop databases are oriented toward single-user applications and reside on standard personal computers (hence the term desktop). Server databases contain mechanisms to ensure the reliability and consistency of data and are geared toward multi-user applications.
Database management systems (or DBMSs) can be divided into two categories -- desktop databases and server databases. Generally speaking, desktop databases are oriented toward single-user applications and reside on standard personal computers (hence the term desktop). Server databases contain mechanisms to ensure the reliability and consistency of data and are geared toward multi-user applications.
Creating Relationships
In the seventh installment of our Building an Access Database From the Ground Up series, we create relationships between our tables to finish implementing our relational model.
In the seventh installment of our Building an Access Database From the Ground Up series, we create relationships between our tables to finish implementing our relational model.
SQL Server Replication
Microsoft SQL Server provides a robust replication facility to distribute and update data in a decentralized fashion.
Microsoft SQL Server provides a robust replication facility to distribute and update data in a decentralized fashion.
Structured Query Language
Most large-scale databases use the Structured Query Language (SQL) to define all user and administrator interactions. This language offers a flexible interface for databases of all shapes and sizes.
Most large-scale databases use the Structured Query Language (SQL) to define all user and administrator interactions. This language offers a flexible interface for databases of all shapes and sizes.
Access File Formats: ACCDB/MDB
The release of Access 2007 brings a new file format. The MDB database files we’ve known for over a decade are now slated to become historical relics. While Access 2007 continues to support MDB databases for backwards compatibility purposes, Microsoft has now introduced the new ACCDB file format as the future standard. Wondering if you should begin using the ACCDB format?
The release of Access 2007 brings a new file format. The MDB database files we’ve known for over a decade are now slated to become historical relics. While Access 2007 continues to support MDB databases for backwards compatibility purposes, Microsoft has now introduced the new ACCDB file format as the future standard. Wondering if you should begin using the ACCDB format?
Using Expression Builder
Have trouble remembering function names or arguments in Microsoft Access? We all do! Access' Expression Builder is a great tool that walks you through the process of creating expressions for your forms, tables, reports and queries while keeping a handy reference at your fingertips.
Have trouble remembering function names or arguments in Microsoft Access? We all do! Access' Expression Builder is a great tool that walks you through the process of creating expressions for your forms, tables, reports and queries while keeping a handy reference at your fingertips.
Candidate Key
What is a Candidate Key? Find out here!
What is a Candidate Key? Find out here!
Password Protecting Access
Password protecting an Access database allows you to protect your sensitive data from prying eyes. In this tutorial, we walk you through the process of encrypting your database and protecting with a password, step by step.
Password protecting an Access database allows you to protect your sensitive data from prying eyes. In this tutorial, we walk you through the process of encrypting your database and protecting with a password, step by step.
Installing Northwind
The Northwind database contains some great sample tables, queries, reports and other database features. Here's how to install it.
The Northwind database contains some great sample tables, queries, reports and other database features. Here's how to install it.
Choosing a Primary Key
Databases depend upon keys to store, sort and compare records. If you’ve been around databases for a while, you’ve probably heard about many different types of keys – primary keys, candidate keys, and foreign keys. When you create a new database table, you’re asked to select one primary key that will uniquely identify records stored in that table.
Databases depend upon keys to store, sort and compare records. If you’ve been around databases for a while, you’ve probably heard about many different types of keys – primary keys, candidate keys, and foreign keys. When you create a new database table, you’re asked to select one primary key that will uniquely identify records stored in that table.
Creating Relationships in Access
Join us as we walk through the process of creating database relationships in Microsoft Access.
Join us as we walk through the process of creating database relationships in Microsoft Access.
Retrieving Data with SQL Queries: Introducing the SELECT Statement
Learn to retrieve information from your database with the SQL SELECT statement. Your About.com Guide to Databases provides a thorough introduction.
Learn to retrieve information from your database with the SQL SELECT statement. Your About.com Guide to Databases provides a thorough introduction.
SQL Books
Looking for a book to help you get started with Strucutred Query Language? Need a new reference book for your shelf? Check out my favorite SQL books.
Looking for a book to help you get started with Strucutred Query Language? Need a new reference book for your shelf? Check out my favorite SQL books.
The ACID Model
All database management systems should share four characteristics: Atomicity, Consistency, Isolation and Durability.
All database management systems should share four characteristics: Atomicity, Consistency, Isolation and Durability.
Top 5 Desktop Databases
Desktop databases offer simple, flexible solutions for data storage and retrieval. They're often quite sufficient to meet uncomplicated database requirements for both small and large organizations. If you're not sure if a desktop database is right for you, try reading the Choosing a Database series of articles which cover both desktop and server databases in depth
Desktop databases offer simple, flexible solutions for data storage and retrieval. They're often quite sufficient to meet uncomplicated database requirements for both small and large organizations. If you're not sure if a desktop database is right for you, try reading the Choosing a Database series of articles which cover both desktop and server databases in depth
Access DBs from Templates
Microsoft provides quite a few prebuilt database templates to assist you in jumpstarting your database development process. In this tutorial, we'll walk through the process of creating an Access database using these templates.
Microsoft provides quite a few prebuilt database templates to assist you in jumpstarting your database development process. In this tutorial, we'll walk through the process of creating an Access database using these templates.
Third Normal Form (3NF) - Databases Glossary
What is Third Normal Form? Find out here!: state zip code database designers abc corporation city state zip columbia md 21046
What is Third Normal Form? Find out here!: state zip code database designers abc corporation city state zip columbia md 21046
Creating an Access Database
In an earlier article, we reviewed the process for creating an Access database from a template. While this is certainly an agreeable, easy approach to building a database, there isn’t always a template available that meets your needs. In this article, we review the process for creating an Access database from scratch.
In an earlier article, we reviewed the process for creating an Access database from a template. While this is certainly an agreeable, easy approach to building a database, there isn’t always a template available that meets your needs. In this article, we review the process for creating an Access database from scratch.
Sample Excel Document
Sample Excel Document
Sample Excel Document
Sample Excel Spreadsheet
This sample Excel spreadsheet provides a starting point for our Microsoft Access tutorials.
This sample Excel spreadsheet provides a starting point for our Microsoft Access tutorials.
Access Controls in SQL
SQL joins allow you to retrieve data from multiple database tables. Your About.com Guide to Databases provides a comprehensive introduction.
SQL joins allow you to retrieve data from multiple database tables. Your About.com Guide to Databases provides a comprehensive introduction.
Attribute
What is an attribute? Find out here!
What is an attribute? Find out here!
Designing Data Access Pages
Want to design a Data Access Page using Access 2000? This step-by-step tutorial walks you through the process.
Want to design a Data Access Page using Access 2000? This step-by-step tutorial walks you through the process.
Functional Dependency
What is a functional dependency? Find out here!
What is a functional dependency? Find out here!
One-to-Many Relationships
Looking for a definition of one-to-many database relationships? Read our definition in the About Databases glossary!
Looking for a definition of one-to-many database relationships? Read our definition in the About Databases glossary!
Query
What is a query? Find out here!
What is a query? Find out here!
Access and the Web
Would you like to share your Access reports with the web? This step-by-step tutorial will walk you through the process.
Would you like to share your Access reports with the web? This step-by-step tutorial will walk you through the process.
Database Relationships
Looking for a definition of a database relationship? Check out the About Databases glossary definition!
Looking for a definition of a database relationship? Check out the About Databases glossary definition!
Exporting Access Data to Excel
It’s often necessary to convert data stored in an Access database to another form, such as an Excel workbook. You may wish to take advantage of some of Excel’s unique analytical capabilities or simply share data with someone unfamiliar with Access. Whatever the reason, the conversion process is fairly straightforward and quick.
It’s often necessary to convert data stored in an Access database to another form, such as an Excel workbook. You may wish to take advantage of some of Excel’s unique analytical capabilities or simply share data with someone unfamiliar with Access. Whatever the reason, the conversion process is fairly straightforward and quick.
Access 2003 Books
So, you'd like to learn more about Microsoft Access 2003 and you don't know where to begin. I've selected five of my favorite introductory-level Access books for your perusal. Follow the "Compare Prices" links for a competitive listing of prices at various web merchants.
So, you'd like to learn more about Microsoft Access 2003 and you don't know where to begin. I've selected five of my favorite introductory-level Access books for your perusal. Follow the "Compare Prices" links for a competitive listing of prices at various web merchants.
Learning SQL E-Course
The Structured Query Language (SQL) forms the backbone of all relational databases. This language offers a flexible interface for databases of all shapes and sizes and is used as the basis for all user and administrator interactions with the database. In this course, you'll learn the basics of using SQL to store, retrieve and manipulate information in a database.
The Structured Query Language (SQL) forms the backbone of all relational databases. This language offers a flexible interface for databases of all shapes and sizes and is used as the basis for all user and administrator interactions with the database. In this course, you'll learn the basics of using SQL to store, retrieve and manipulate information in a database.
Introduction to SQL Server
SQL Server offers full-featured relational database functionality in a user-oriented package. Learn about the various components of SQL Server in this article.
SQL Server offers full-featured relational database functionality in a user-oriented package. Learn about the various components of SQL Server in this article.
Creating an ADO Connection
The first step in developing an ADO application is to create a connection to a data source. This tutorial walks you through the process.
The first step in developing an ADO application is to create a connection to a data source. This tutorial walks you through the process.
Timestamps in Microsoft Access
There are many applications where you may wish to add a date/time stamp to each record, identifying the time that the record was added to the database. It’s easy to do this in Microsoft Access using the Now() function. In this tutorial, I explain the process step-by-step.
There are many applications where you may wish to add a date/time stamp to each record, identifying the time that the record was added to the database. It’s easy to do this in Microsoft Access using the Now() function. In this tutorial, I explain the process step-by-step.
SQL Server Recovery Models
SQL Server provides three different recovery models that allow you to specify the way SQL Server manages log files and prepares your enterprise for a disaster. Each of these models represents a different approach to balancing the tradeoff between conserving disk space and providing for granular disaster recovery options.
SQL Server provides three different recovery models that allow you to specify the way SQL Server manages log files and prepares your enterprise for a disaster. Each of these models represents a different approach to balancing the tradeoff between conserving disk space and providing for granular disaster recovery options.
All About NULL Values
Users new to the world of databases are often confused by a special value particular to our field – the NULL value. Read about the proper uses of NULL in this article.
Users new to the world of databases are often confused by a special value particular to our field – the NULL value. Read about the proper uses of NULL in this article.
One-to-One Relationships
Looking for a definition of one-to-one database relationships? Read our definition in the About Databases glossary!
Looking for a definition of one-to-one database relationships? Read our definition in the About Databases glossary!
Database Instance
Looking for a definition of a database instance? Look no further!
Looking for a definition of a database instance? Look no further!
Stored Procedure
Looking for a definition of the database term stored procedure? Find it here in the About Databases glossary.
Looking for a definition of the database term stored procedure? Find it here in the About Databases glossary.
Data Input Via Forms
Part VIII of our tutorial introduces you to the concept of Access forms to input and modify data.
Part VIII of our tutorial introduces you to the concept of Access forms to input and modify data.
bcp
The bulk copy (bcp) command of Microsoft SQL Server provides you with the ability to insert large numbers of records directly from the command line. In addition to being a great tool for command-line aficionados, bcp is a powerful tool for those seeking to insert data into a SQL Server database from within a batch file or other programmatic method.
The bulk copy (bcp) command of Microsoft SQL Server provides you with the ability to insert large numbers of records directly from the command line. In addition to being a great tool for command-line aficionados, bcp is a powerful tool for those seeking to insert data into a SQL Server database from within a batch file or other programmatic method.
Database Management System
A database management system (DBMS) is the software that allows a computer to perform database functions of storing, retrieving, adding, deleting and modifying data.
A database management system (DBMS) is the software that allows a computer to perform database functions of storing, retrieving, adding, deleting and modifying data.
SQL Server 2005 Introduction
The long awaited Yukon is almost here! Microsoft plans to release SQL Server 2005 later this year and has packed the new database engine full of features.
The long awaited Yukon is almost here! Microsoft plans to release SQL Server 2005 later this year and has packed the new database engine full of features.
First Normal Form (1NF)
What is First Normal Form? Find out here!
What is First Normal Form? Find out here!
Rational Access Templates
Zac Woodall's book provides an excellent introduction to creating and sharing Microsoft Access database templates. It's a wonderful reference for anyone who needs to occasionally or regularly design or develop Access templates.
Zac Woodall's book provides an excellent introduction to creating and sharing Microsoft Access database templates. It's a wonderful reference for anyone who needs to occasionally or regularly design or develop Access templates.
Binary Data Types
Binary data types allow you to store any type of binary data, including entire files of up to 2GB. They include binary, varbinary, image and bit.
Binary data types allow you to store any type of binary data, including entire files of up to 2GB. They include binary, varbinary, image and bit.
Top 10 SQL FAQs
Looking for advice on using the Structured Query Language? The About Databases SQL FAQ provides answers to the most frequently asked questions about SQL and databases.
Looking for advice on using the Structured Query Language? The About Databases SQL FAQ provides answers to the most frequently asked questions about SQL and databases.
Second Normal Form (2NF) - Databases Glossary
What is Second Normal Form? Find out here!: acme widgets fred flintstone abc corporation john doe two tables
What is Second Normal Form? Find out here!: acme widgets fred flintstone abc corporation john doe two tables
SQL Server Disaster Recovery
There are numerous threats to your data -- disk corruption, natural disaster, human error and server failure, among others. Is your disaster recovery plan sufficient to ensure your organization's interests are protected?
There are numerous threats to your data -- disk corruption, natural disaster, human error and server failure, among others. Is your disaster recovery plan sufficient to ensure your organization's interests are protected?
Superkey
What is a superkey? Find out here!
What is a superkey? Find out here!
Microsoft Access SQL Queries
Did you know that you can view and edit the SQL statements that drive every Microsoft Access database query? In this article, we take a look at the process of accessing the underlying SQL code and tweaking it to perfect Access queries.
Did you know that you can view and edit the SQL statements that drive every Microsoft Access database query? In this article, we take a look at the process of accessing the underlying SQL code and tweaking it to perfect Access queries.
Creating the Database File
In part five of our Building An Access Database From the Ground Up series, we create the Access database file that will be used for the Patrick's Widgets database.
In part five of our Building An Access Database From the Ground Up series, we create the Access database file that will be used for the Patrick's Widgets database.
Retreiving Data with SELECT
The SELECT command is the most commonly used command in SQL. It allows database users to retrieve the specific information they desire from an operational database.
The SELECT command is the most commonly used command in SQL. It allows database users to retrieve the specific information they desire from an operational database.
User Level Security in Access
If you’re a Microsoft Office power user, you might be familiar with the encryption features of Word, PowerPoint and Excel. These programs all allow file owners to easily apply encryption. Unfortunately, Microsoft Access doesn’t offer similar functionality, but it still has relatively powerful security functionality. In this article, we’ll take a look at Microsoft Access user-level security, a feature that lets you specify the level of access to grant each individual user of your database.
If you’re a Microsoft Office power user, you might be familiar with the encryption features of Word, PowerPoint and Excel. These programs all allow file owners to easily apply encryption. Unfortunately, Microsoft Access doesn’t offer similar functionality, but it still has relatively powerful security functionality. In this article, we’ll take a look at Microsoft Access user-level security, a feature that lets you specify the level of access to grant each individual user of your database.
SQL Server Data Types
Selecting appropriate data types is one of the most important considerations when designing a SQL Server database. Choices you make in the database design phase may have a significant impact on the efficiency, performance and storage requirements of your database down the road.
Selecting appropriate data types is one of the most important considerations when designing a SQL Server database. Choices you make in the database design phase may have a significant impact on the efficiency, performance and storage requirements of your database down the road.
Access 2007 Books
So, you'd like to learn more about Microsoft Access 2007 and you don't know where to begin. I've selected five of my favorite introductory-level Access books for your perusal. Follow the "Compare Prices" links for a competitive listing of prices at various web merchants.
So, you'd like to learn more about Microsoft Access 2007 and you don't know where to begin. I've selected five of my favorite introductory-level Access books for your perusal. Follow the "Compare Prices" links for a competitive listing of prices at various web merchants.
Normalization
What is database normalization? Find out here!
What is database normalization? Find out here!
Adding Tables to Your Database
In Part 6 of our Building an Access Database From the Ground Up series, we’ll build the tables necessary to implement the relational structure developed in Part 4 that builds upon the Patrick’s Widgets scenario from Part 3.
In Part 6 of our Building an Access Database From the Ground Up series, we’ll build the tables necessary to implement the relational structure developed in Part 4 that builds upon the Patrick’s Widgets scenario from Part 3.
Flat File
What is a flat file? Find out here!
What is a flat file? Find out here!
Modifying a Query in Microsoft Access
Want to learn how to modify a query in Microsoft Access? Find out on the About.com Databases site!
Want to learn how to modify a query in Microsoft Access? Find out on the About.com Databases site!
Column
What is a database column? Find out here!
What is a database column? Find out here!
Introduction to MySQL
Now that you’ve installed MySQL, it’s time to perform some basic administrative and configuration tasks to ensure that your database environment is ready for production. In this installment of our MySQL series, we’ll look at the process of configuring MySQL on a Linux system
Now that you’ve installed MySQL, it’s time to perform some basic administrative and configuration tasks to ensure that your database environment is ready for production. In this installment of our MySQL series, we’ll look at the process of configuring MySQL on a Linux system
Cardinality
What is Cardinality? Find out here!
What is Cardinality? Find out here!
UNIQUE Constraints
UNIQUE constraints allow SQL Server administrators to specify that a column may not contain duplicate values. When you create a new UNIQUE constraint, SQL Server checks the column in question to determine whether it contains any duplicate values. If the table contains preexisting duplicates, the constraint creation command fails. Similarly, once you have a UNIQUE constraint on a column, attempts to add or modify data that would cause duplicates to exist also fail.
UNIQUE constraints allow SQL Server administrators to specify that a column may not contain duplicate values. When you create a new UNIQUE constraint, SQL Server checks the column in question to determine whether it contains any duplicate values. If the table contains preexisting duplicates, the constraint creation command fails. Similarly, once you have a UNIQUE constraint on a column, attempts to add or modify data that would cause duplicates to exist also fail.
SQL Injection Testing
SQL Injection attacks pose tremendous risks to web applications that depend upon a database backend to generate dynamic content. In this type of attack, hackers manipulate a web application in an attempt to inject their own SQL commands into those issued by the database. In this article, we take a look at several ways you can test your web applications to determine whether they're vulnerable to SQL Injection attacks.
SQL Injection attacks pose tremendous risks to web applications that depend upon a database backend to generate dynamic content. In this type of attack, hackers manipulate a web application in an attempt to inject their own SQL commands into those issued by the database. In this article, we take a look at several ways you can test your web applications to determine whether they're vulnerable to SQL Injection attacks.
Backing Up Access Databases
Backing up your Microsoft Access databases is an important part of protecting your critical data. In this tutorial, we walk through the process of backing up an Access database, step-by-ste.
Backing up your Microsoft Access databases is an important part of protecting your critical data. In this tutorial, we walk through the process of backing up an Access database, step-by-ste.
Triggers
Triggers may be used to automate common database actions. Learn how to apply them effectively!
Triggers may be used to automate common database actions. Learn how to apply them effectively!
SQL Server Tables Tutorial
SQL Server databases rely upon tables to store data. In this tutorial, we'll explore the process of designing and implementing a database table in Microsoft SQL Server.
SQL Server databases rely upon tables to store data. In this tutorial, we'll explore the process of designing and implementing a database table in Microsoft SQL Server.
Partitioning SQL Server Tables
Looking to optimize the performance of your SQL Server database? If your database contains very large tables, you may benefit from partitioning those tables onto separate filegroups. This technology, introduced in SQL Server 2005, allows you to spread data onto different physical disks, leveraging the concurrent performance of those disks to optimize query performance.
Looking to optimize the performance of your SQL Server database? If your database contains very large tables, you may benefit from partitioning those tables onto separate filegroups. This technology, introduced in SQL Server 2005, allows you to spread data onto different physical disks, leveraging the concurrent performance of those disks to optimize query performance.
Two-Tier or n-Tier?
What's best for your situation? Two-tier, three-tier or n-tier databases? Find out here!
What's best for your situation? Two-tier, three-tier or n-tier databases? Find out here!
How To Install MS Access 2007
Due to its widespread availability and flexible functionality, Microsoft Access is arguably the most popular database software in use today. In this "How To", we explain the Access installation process in a straightforward manner.
Due to its widespread availability and flexible functionality, Microsoft Access is arguably the most popular database software in use today. In this "How To", we explain the Access installation process in a straightforward manner.
Fourth Normal Form (4NF)
What is Fourth Normal Form? Find out here!
What is Fourth Normal Form? Find out here!
Table
What is a database table? Find out here!
What is a database table? Find out here!
Rollback
What is rollback? Find out here!
What is rollback? Find out here!
Log Shrinking and Truncation
The transaction log plays a critical role in a SQL Server database: it maintains an ongoing record of database activity crucial for the restoration of recent data in the event of a disaster. However, this benefit comes at a cost: the transaction log can consume a substantial amount of space in an active database. SQL Server provides two actions designed to counterbalance these large space requirements: transaction log truncation and log file shrinking.
The transaction log plays a critical role in a SQL Server database: it maintains an ongoing record of database activity crucial for the restoration of recent data in the event of a disaster. However, this benefit comes at a cost: the transaction log can consume a substantial amount of space in an active database. SQL Server provides two actions designed to counterbalance these large space requirements: transaction log truncation and log file shrinking.
Clustering
What is clustering? Learn more about this data mining term here!
What is clustering? Learn more about this data mining term here!
Backing up an Access Database
I've often been asked "How do I create a backup of my Access database?" Until now, that's been a difficult question to answer. Prior to Access 2003, you would have to manually copy your Access .MDB files into a secure storage location. That's all changed with Access 2003. In this tutorial, we'll walk through the process of backing up your Access database using the new built-in backup functionality.
I've often been asked "How do I create a backup of my Access database?" Until now, that's been a difficult question to answer. Prior to Access 2003, you would have to manually copy your Access .MDB files into a secure storage location. That's all changed with Access 2003. In this tutorial, we'll walk through the process of backing up your Access database using the new built-in backup functionality.
Microsoft Access
What is Microsoft Access? Find out here!
What is Microsoft Access? Find out here!
SQLCMD Step-by-Step
Microsoft SQL Server provides users with a variety of rich graphical user interfaces to retrieve and manipulate data and configure SQL Server databases. However, sometimes it’s just easier to work from the old-fashioned command line. Whether you’re looking for a quick-and-dirty way to execute a SQL query or wish to include SQL statements in a Windows script file, SQLCMD allows you to meet your goal.
Microsoft SQL Server provides users with a variety of rich graphical user interfaces to retrieve and manipulate data and configure SQL Server databases. However, sometimes it’s just easier to work from the old-fashioned command line. Whether you’re looking for a quick-and-dirty way to execute a SQL query or wish to include SQL statements in a Windows script file, SQLCMD allows you to meet your goal.
SOUNDEX String Comparison
Can a filing system from the 1890s assist you with string comparison in modern databases? Read on!
Can a filing system from the 1890s assist you with string comparison in modern databases? Read on!
SQL Server Authentication
Microsoft SQL Server 2008 offers administrators two choices of performing user authentication: Windows authentication mode and mixed authentication mode. Making the proper choice affects both the security and maintenance of your organization’s databases.
Microsoft SQL Server 2008 offers administrators two choices of performing user authentication: Windows authentication mode and mixed authentication mode. Making the proper choice affects both the security and maintenance of your organization’s databases.
HIPAA Privacy and Security
The Health Insurance Portability and Accountability Act of 1996 (HIPAA) places a large regulatory burden on organizations that deal with certain types of health-related information. We're now only a couple of weeks away from the compliance deadline for the Security Rule. Are you ready for April 21st?
The Health Insurance Portability and Accountability Act of 1996 (HIPAA) places a large regulatory burden on organizations that deal with certain types of health-related information. We're now only a couple of weeks away from the compliance deadline for the Security Rule. Are you ready for April 21st?
Print Mailing Labels in Access
One of the most common uses of a database is generating mass mailings. In this tutorial, we examine the process of creating mailing labels using Microsoft Access using the built-in Label Wizard. We begin with a database containing the address data and walk you step-by-step through the process of creating and printing your mailing labels.
One of the most common uses of a database is generating mass mailings. In this tutorial, we examine the process of creating mailing labels using Microsoft Access using the built-in Label Wizard. We begin with a database containing the address data and walk you step-by-step through the process of creating and printing your mailing labels.
Access 2007 User Interface
If you’re switching to Microsoft Access 2007 from an earlier version, you’re bound to immediately notice some major changes in the user interface. Microsoft modeled the Access 2007 look-and-feel after the Windows Vista model, providing the application with a clean, high-tech look that could dramatically alter your workflow. In this article, we walk through the new interface. We’ll explore the Ribbon, the Microsoft Office button, the Navigation Pane and other features of Access 2007.
If you’re switching to Microsoft Access 2007 from an earlier version, you’re bound to immediately notice some major changes in the user interface. Microsoft modeled the Access 2007 look-and-feel after the Windows Vista model, providing the application with a clean, high-tech look that could dramatically alter your workflow. In this article, we walk through the new interface. We’ll explore the Ribbon, the Microsoft Office button, the Navigation Pane and other features of Access 2007.
Convert to Access 2007 Format
The ACCDB database format introduced in Access 2007 provides a number of enhanced features over the older MDB format. In this article, we'll walk you through the process of converting an MDB format database to the new ACCDB format.
The ACCDB database format introduced in Access 2007 provides a number of enhanced features over the older MDB format. In this article, we'll walk you through the process of converting an MDB format database to the new ACCDB format.
Oracle
What is Oracle? Find out here!
What is Oracle? Find out here!
Classification
What is classification? Learn about this data mining term here.
What is classification? Learn about this data mining term here.
CHECK Constraints
CHECK constraints allow you to limit the types of data that users may insert in a database. They go beyond data types and allow you to define the specific values that may be included in a column.
CHECK constraints allow you to limit the types of data that users may insert in a database. They go beyond data types and allow you to define the specific values that may be included in a column.
Schema
What is a database schema? Find out here!
What is a database schema? Find out here!
SQL Server Isolation Models
Normally, it's best to allow SQL Server to enforce isolation between transactions in its default manner; after all, isolation is one of the basic tenets of the ACID model. However, sometimes business requirements force database administrators to stray from the default behavior and adopt a less rigid approach to transaction isolation. To assist in such cases, SQL Server offers five different transaction isolation models.
Normally, it's best to allow SQL Server to enforce isolation between transactions in its default manner; after all, isolation is one of the basic tenets of the ACID model. However, sometimes business requirements force database administrators to stray from the default behavior and adopt a less rigid approach to transaction isolation. To assist in such cases, SQL Server offers five different transaction isolation models.
k-means Clustering
k-means clustering is a data mining/machine learning algorithm used to cluster observations into groups of related observations without any prior knowledge of those relationships. The k-means algorithm is one of the simplest clustering techniques and it is commonly used in medical imaging, biometrics and related fields.
k-means clustering is a data mining/machine learning algorithm used to cluster observations into groups of related observations without any prior knowledge of those relationships. The k-means algorithm is one of the simplest clustering techniques and it is commonly used in medical imaging, biometrics and related fields.
Date and Time Data Types
The date and time SQL Server data types are used to store calendar information. They include the datetime, smalldatetime and timestamp variables.
The date and time SQL Server data types are used to store calendar information. They include the datetime, smalldatetime and timestamp variables.
Access Queries
Part 9 of our Building an Access Database From the Ground Up series explores the use of queries to retrieve information from a database.
Part 9 of our Building an Access Database From the Ground Up series explores the use of queries to retrieve information from a database.
Character String Data Types
Character string data types are used to store text values in Microsoft SQL Server databases.
Character string data types are used to store text values in Microsoft SQL Server databases.
How To Install the Northwind Sample Database in Microsoft Access
Learn how to install the Northwind sample database in Microsoft Access.
Learn how to install the Northwind sample database in Microsoft Access.
Key
What is a database key? Find out here!
What is a database key? Find out here!
Exact Numeric Data Types
The exact numeric data types are the most common SQL Server data types used to store numeric information. They include integers (int), big integers (bigint), tiny integers (tinyint), small integers (smallint), decimal and numeric values.
The exact numeric data types are the most common SQL Server data types used to store numeric information. They include integers (int), big integers (bigint), tiny integers (tinyint), small integers (smallint), decimal and numeric values.
Database Certifications
Popular database certifications are always in demand, whether it's Microsoft's MCTS or MCITP, Oracle's OCA, OCP and OCM or MySql's CMA, CMDEV and CMDBA. Are you a database professional seeking to polish your resume in the hopes of landing a better gig? Database vendors offer a variety of professional certification programs that can help you advance your career while gaining valuable technical skills.
Popular database certifications are always in demand, whether it's Microsoft's MCTS or MCITP, Oracle's OCA, OCP and OCM or MySql's CMA, CMDEV and CMDBA. Are you a database professional seeking to polish your resume in the hopes of landing a better gig? Database vendors offer a variety of professional certification programs that can help you advance your career while gaining valuable technical skills.
Database
What is a database? Find out here!
What is a database? Find out here!
Splitting an Access Database
Oftentimes, you wish to share data with users in your organization who may, in turn, wish to create their own forms and reports. While you may want them to have the ability to view and/or update your data, you may not wish them to modify the interface you use to work with the data yourself. Fortunately, Microsoft Access provides the ability to split a database into front-end and back-end components. You can safely share data with other users while keeping your interface private.
Oftentimes, you wish to share data with users in your organization who may, in turn, wish to create their own forms and reports. While you may want them to have the ability to view and/or update your data, you may not wish them to modify the interface you use to work with the data yourself. Fortunately, Microsoft Access provides the ability to split a database into front-end and back-end components. You can safely share data with other users while keeping your interface private.
GROUP BY Statement
You may use basic SQL queries to retrieve data from a database but this often doesn’t provide enough intelligence to meet business requirements. SQL also provides you with the ability to group query results based upon row-level attributes in order to apply aggregate functions using the GROUP BY clause.
You may use basic SQL queries to retrieve data from a database but this often doesn’t provide enough intelligence to meet business requirements. SQL also provides you with the ability to group query results based upon row-level attributes in order to apply aggregate functions using the GROUP BY clause.
Report
What is a database report? Find out here!
What is a database report? Find out here!
SQL Server Agent Alerts
SQL Server allows you to automatically notify database administrators when unusual circumstances occur. This powerful alerting mechanism enables 24-hour monitoring of your database performance without staffing a 24-hour operations center.
SQL Server allows you to automatically notify database administrators when unusual circumstances occur. This powerful alerting mechanism enables 24-hour monitoring of your database performance without staffing a 24-hour operations center.
ACCDB File Format
The ACCDB database file format was introduced with the release of Microsoft Access 2007 to replace the older MDB file format. The use of ACCDB format allows users to leverage enhanced functionality in Access, including the use of multivalued fields and strong cryptography.
The ACCDB database file format was introduced with the release of Microsoft Access 2007 to replace the older MDB file format. The use of ACCDB format allows users to leverage enhanced functionality in Access, including the use of multivalued fields and strong cryptography.
Access 2007 Tips
Looking to shave some time off your daily Microsoft Access administration and design tasks? There are many great, little-known features of this program that you can use to improve the efficiency of your database experience. I've put together a collection of ten tips that will improve your Microsoft Access experience.
Looking to shave some time off your daily Microsoft Access administration and design tasks? There are many great, little-known features of this program that you can use to improve the efficiency of your database experience. I've put together a collection of ten tips that will improve your Microsoft Access experience.
Record
What is a database record? Find out here!
What is a database record? Find out here!
PHP
What is PHP? Find out here!
What is PHP? Find out here!
Show or Hide Access Tabs
Access 2007 introduces the tabbed document format found in other Microsoft Office products. In some cases, you may wish to hide these tabs to change the look and feel of your database or more closely simulate the appearance of older versions of Access.
Access 2007 introduces the tabbed document format found in other Microsoft Office products. In some cases, you may wish to hide these tabs to change the look and feel of your database or more closely simulate the appearance of older versions of Access.
SQL Injection Attacks
One common type of database attack, the SQL Injection, allows a malicious individual to execute arbitrary SQL code on your server. Let's take a look at how it works by analyzing a very simple web application that processes customer orders.
One common type of database attack, the SQL Injection, allows a malicious individual to execute arbitrary SQL code on your server. Let's take a look at how it works by analyzing a very simple web application that processes customer orders.
Regression
What is regression? Learn more about this data mining term here.
What is regression? Learn more about this data mining term here.
Converting an Excel Spreadsheet to an Access Database
Are you ready to convert your unweildy Excel spreadsheet to a flexible Access database? Let us walk you through the process!
Are you ready to convert your unweildy Excel spreadsheet to a flexible Access database? Let us walk you through the process!