Re: index not being pick up
Again, even without an OR clause in the join eg ...
select a.* from a join b using (pk_of_a);
... MySQL usually won't use a key on table a in ...but if a.* becomes a list of indexed columns, it will.
Edited 1 time(s). Last edit at 01/21/2018 09:47PM by Peter Brawley.
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