Eugene Kosov wrote:
Chris Faulkner wrote:
HI
I have a query like this
select * from table where (
( field1 = 'VALUE1' and field2 like 'VALUE2%' ) OR ( field3 = 'VALUE1'
and field2 like 'VALUE2%' ) )
I have created two composite indexes - one on field1 + field2 and one
on field3 + field2. Explain on the SQL indicates that the indexes are
possibly used. The query takes an age to run and looking at my log
indicates a full table scan.
I have also tried indexing just field1 and field3 separately but this
doesn't help. I have run an analyze.
Chris
Mysql use an index only if indexed field(s) present(s) in both OR
arguments..
Sorry, but i can't find it in docs right now, so i can't give you any
helpful link.
I think index on field2 may help you here..
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