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Default Values

By , About.com Guide

Definition: Default vlaues allow you to specify a value that the database will use to populate fields that are left blank in the input source. They’re a replacement for the use of NULL values that provide a great way to predefine common data elements.
Also Known As: default constraints
Examples:
You can use a default value to specify a standard discount that applies to customers who do not have a custom discount set.

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