Re: [SQL] Good Optimization

> > There is a simple way to optimize SQL queries involving joins to
> > PostgreSQL that I think should be handled by Postgre? If one is joining
> > a tables a,b on attribute "x" and if one has something like x=3 then it
> > helps A LOT to say: a.x=3 and b.x=3 in addition to saying a.x=b.x ...
> > The example below shoulds the radical speed gain of doing this, and I
> > think it isn't something real obvious to most people...
> >
> > Of course it could just be a common thing to do in SQL, anyway, just
> > thought I'd let you all know what I discovered.
> >
> >
> >
> > Here is an example:
> > [...]
>
> Hmmmmm,
>
> wouldn't it be nice to do such things automagically
> (rewriter? planner?).

Added to TODO:

* In WHERE x=3 AND x=y, add y=3

--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026