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Re: Need to optimise complex query
Posted by: KimSeong Loh
Date: April 30, 2007 08:36PM

Don't think it helps.

The Ent table is using type eq_ref now with the PRIMARY key, so the join is very efficient already, only that it has a using where for the Ent.Citycode IN ('xxx','xxx')

If you want, you can try to create an index on (Primary key , Citycode) , maybe this will remove the using where if it can use both part of this index.
Worth trying only if many rows are filtered away with this IN condition.

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