Use 'exists' or 'not exists' only if you have index on col3 and col4 on table_2 that can be used in the sub-query, else the query will be running like a dog.
Raj ______________________________________________________ Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art!
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