Can we use the exists keyword in Oracle as in MS SQL Server? Like IF Exists (SQL statement). Or is there any other equivalent way?
You can use the EXISTS statement. However, the EXISTS and NOT EXISTS statements typically perform much better in SQL Server than they do in Oracle. Typically, the IN and NOT IN operators perform better in Oracle and do essentially the same thing. You can also rewrite most queries that use EXISTS to use a join instead.
No matter what you do, make sure you test your different approaches. If you notice, I used the word "typically" above, and that was on purpose. There are always exceptions to the rule. Only you can answer which will perform better with your data.
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