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nullable
Last modified: Tuesday, February 21, 2006 

In database management, a field that is allowed to have no values is called nullable. Depending on the application, nullable may also be called a null reference or null object.

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MS SQL 6.5 - Storage Nullable Fields
Place all nullable fields to the end of the field's list (after fields with fixed length), so than more often this field will contain NULL value, the closer to the end of the record it should be placed.

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aggregate function

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