Re: Query Optimization Needed
The usual rule of thumb for a covering index is WHERE clause columns then JOIN columns then Select columns. Did you try index(created_on,user_id,deviceid)? If that doesn't help, let's see the result of Explain Extended on the query.
Edited 1 time(s). Last edit at 02/12/2015 12:53PM by Peter Brawley.
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Re: Query Optimization Needed
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