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Tuesday, July 10, 2012

Why Avoid Permitting NULL values in Microsoft SQL Server

NULL value in column in Microsoft SQL Server means that no entry has been made into the column. It states that the corresponding value is either unknown or undefined. It is also different from zero or "". 

We should avoid permitting null values because Column with NULL values can't have PRIMARY KEY constraints. Certain calculations can be inaccurate if NULL columns are involved.

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