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Microsoft® SQL Server 2012 Unleashed by Alex T. Silverstein, Chris Gallelli, Paul T. Bertucci, Ray Rankins

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Defaults

A default provides a value for a column when a value is not supplied. Defaults can be anything that evaluates to a constant, such as a constant, built-in function, or mathematical expression. Defaults are of two types: declarative and bound. The two types are functionally the same; the difference is in how they are implemented.

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