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SQL Query Performance - Which One To Choose SQL OR Operator Or UNION ON operator

Follow @RebellionRider for more SQL interview questions. Interviewer: Why does using OR in WHERE slow down SQL compared to UNION ALL? Here’s the blunt truth. OR confuses the optimizer. When you write: WHERE col1 = 10 OR col2 = 20 The database often cannot use indexes efficiently. It may ignore both indexes. It may switch to a full table scan ...

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