Re: [HACKERS] PC Week Labs benchmark results

At 04:38 AM 2/4/00 -0500, Mike Mascari wrote:

>That's always been annoying, although it can be simulated
>easily with:
>
>SELECT t1.x, t2.y
>FROM t1, t2
>WHERE t1.x = t2.x
>UNION
>SELECT t1.x, NULL
>FROM t1 WHERE NOT EXISTS ( SELECT t2.x FROM t2 WHERE t1.x =
>t2.x );

SOME - but not all - outer joins can be simulated with this
trick. Others require subselects in the target list, etc.

And the union form gets really messy when a query includes more
than one outer join.

- Don Baccus, Portland OR <dhogaza(at)pacifier(dot)com>
Nature photos, on-line guides, Pacific Northwest
Rare Bird Alert Service and other goodies at
http://donb.photo.net.