| From: | Don Baccus <dhogaza(at)pacifier(dot)com> |
|---|---|
| To: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Hackers List <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Functions returning sets |
| Date: | 2001-05-20 18:29:00 |
| Message-ID: | 3.0.1.32.20010520112900.01728e10@mail.pacifier.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
At 10:55 AM 5/20/01 -0700, Stephan Szabo wrote:
> Can the IN always get written as a
>join and is it always better to do so?
Nope:
openacs4=# select 1 in (1,2,3);
?column?
----------
t
(1 row)
You might also do something like
"select count(*) from foo where foo.state in ('rejected', 'banned');"
A better question, I guess, is if it is always better to write
it as a join if the left hand operand is a table column and
the right hand operand a rowset.
- 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.
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