COUNT (Transact-SQL) - 0 views
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COUNT(*) returns the number of items in a group. This includes NULL values and duplicates. COUNT(ALL expression) evaluates expression for each row in a group and returns the number of nonnull values. COUNT(DISTINCT expression) evaluates expression for each row in a group and returns the number of unique, nonnull values.
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Abdelrahman Ogail on 10 Jun 09Count Function is a Mathematical Aggregation Function. Many forms of it appreas below
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Islam TeCNo on 10 Jun 09ana fahem el kalam eli maktoub :D bas mesh fahm el bo2en eli enta katbhom dol :D
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Abdelrahman Ogail on 10 Jun 09In Relational Algebra and Set Theory COUNT is a type of function called Aggregation Function that is applied to an attribute (databse column) and results in one value
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Islam TeCNo on 10 Jun 09ahaaaa ...thanks ZiKaS
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