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login_id isnt unique index, its normal and there are chances of NULL values as well.
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yogesh777 started a topic explain : different output for a query using order by
explain : different output for a query using order byi have two simple queries using order by clause and and I am trying to figure out how can i prevent filesort in query execution.
Query 1# SELECT * FROM ad_details where ad_id='1110330' ORDER...
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