From: Roland Roberts <roland@astrofoto.org>
To: pgsql-sql@postgresql.org
Subject: Re: LIMIT within UNION?
Date: 12 Sep 2002 15:35:14 -0400
Message-ID: <m27khrovbh.fsf@kuiper.rlent.pnet> (raw)
In-Reply-To: <Pine.LNX.4.21.0209121454540.32000-100000@perrin.socsci.unc.edu>
References: <Pine.LNX.4.21.0209121454540.32000-100000@perrin.socsci.unc.edu>
>>>>> "Andrew" == Andrew Perrin <clists@perrin.socsci.unc.edu> writes:
Andrew> What I've done is to write a script that counts the number
Andrew> of eligible exposure candidates:
Andrew> SELECT count(*) FROM participants WHERE <eligibility>
Andrew> AND typenr=1
Andrew> Then subtract that number (currently 28) from 200 to get
Andrew> 172 control participants. Then the problem starts.
[...]
Andrew> returns ERROR: parser: parse error at or near "ORDER"
Can you do this via a subselect:
SELECT * FROM
( SELECT ... FROM participants
WHERE typenr=1 AND <eligibility>
UNION
SELECT ... FROM participants
WHERE typenr=2 LIMIT 172 )
ORDER BY zip;
roland
--
PGP Key ID: 66 BC 3B CD
Roland B. Roberts, PhD RL Enterprises
roland@rlenter.com 76-15 113th Street, Apt 3B
roland@astrofoto.org Forest Hills, NY 11375
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: roland@astrofoto.org
Subject: Re: LIMIT within UNION?
In-Reply-To: <m27khrovbh.fsf@kuiper.rlent.pnet>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox