Dear MySQL forum.
I have performance problems when using left join x combined with
where x.y is null, in particularily when combining three tables this
way.
Please contact me by e-mail if you are familiar with these issues and
know how to eliminate slow queries.
I would really appreciate your
2010/3/19 Olav Mørkrid olav.mork...@gmail.com
Dear MySQL forum.
I have performance problems when using left join x combined with
where x.y is null, in particularily when combining three tables this
way.
With a left join, particularly when you're using *is (not) null*, you can't
use index
