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Gotcha! SQL Aggregate Functions and NULL

Working with NULL functions can be tricky in T-SQL and SQL Server 2000. If you add in aggregates, you need to be sure you understand what the behavior will be or you might report incorrect values to a user. Michael Coles has written a new article that talks about how NULL affects your results.

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2008-04-04 (first published: )

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Identities and Sequences V

When thinking about the identity property and sequence objects, which of these can generate values before an insert statement is executed?

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