This should be a quickie.<BR><BR>I need to write a query that has to run in a tight loop in my application, so I want to make it efficient.<BR><BR>Is there any significant difference in efficiency ...

The EXISTS condition is an operator whose right operand is a subquery. The result of an EXISTS condition is true if the subquery resolves to at least one row. The result of a NOT EXISTS condition is ...

If you are unlucky enough to have the surname "Null", you basically don't exist, as far as some SQL servers are concerned iStock It is a troublesome process registering for an account with online ...