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Re: Slow Query, Optimization Advice Needed
Posted by: Peter Brawley
Date: April 27, 2016 11:28PM

In(Select...) can be a performance killer, especially before MySQL 5.6. Yours just selects an M row with locationid matching L and a trailerid with the highest tbmovements value. That can be done with a join.

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Re: Slow Query, Optimization Advice Needed
April 27, 2016 11:28PM

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