John.H wrote:
I have two tables and I must do :
select `id`,`bid`,`title`,`link`,`bname` from table1 where `bid` in
( ...this is a subquery in table2 )
should I create a index (`id`,`bid`,`title`,`link`,`bname`) so that my
query
will take less time
or should a index contain so many colums?
Indexes are only needed for the where clauses, not for the items you are
selecting.
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