As any database admin knows, mastering the subtler nuances of SQL can be likened to the black arts. For me, tuning the efficiency of SQL queries on large, heavily used databases is a perfect example.

(SQL Server 2000)<BR><BR>I have a query that basically selects a lot of "complicated" stuff and then dumps it into a #temp table.<BR><BR>I then have a correlated subquery that runs against the temp ...