"Scott Marlowe" <scott.marlowe@gmail.com> writes:
> Note that, at least in older versions, MySQL completely materialized a
> temporary table from a view, then used that for the view. This is
> horribly inefficient, and results in a lot of people thinking views
> are slow. Not sure if this has been addressed in MySQL yet, don't
> really care anymore, since I rarely use mysql for anything anymore.
Some simple experiments with mysql 5.0.67 suggest that this meme is
obsolete there too. I found some cases where it looks like we optimize
a bit better than they do, but for simple views you seem to get the
same plan as if you'd written out the equivalent query in-line.
regards, tom lane