From: Oliver Elphick <olly@lfix.co.uk>
To: Eric L. Blevins <eblevins@insight.rr.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Help with SQL
Date: 16 Oct 2002 21:38:59 +0100
Message-ID: <1034800739.22821.105.camel@linda> (raw)
In-Reply-To: <009c01c27541$83bf46b0$0201a8c0@Gateway>
References: <009c01c27541$83bf46b0$0201a8c0@Gateway>
On Wed, 2002-10-16 at 19:26, Eric L. Blevins wrote:
> I've got 2 SQL statements I would like to combine into one.
...
> statement 1: SELECT uid, count(uid) FROM triangulated WHERE uid != 'anonymus' AND uid
> != 'anonymous' AND uid != '' GROUP BY uid ORDER BY count DESC LIMIT 10;
...
> statement 2: SELECT uid, count(uid) FROM points WHERE uid != 'anonymus' AND uid !=
> 'anonymous' AND uid != '' GROUP BY uid ORDER BY count DESC LIMIT 10;
...
> what I want to do is have one statement that returns something like this:
> uid | count1 | count2
> eblevins 1179 23595
> DaClyde 398 11031
> Drew 30 104
> zombiechick 3 159
>
> So everything is ordered like statement 1 but includes the count(uid) from the points DB like statement 2 returns
SELECT * FROM
(SELECT uid, count(uid) AS count1
FROM triangulated
WHERE uid != 'anonymus' AND
uid != 'anonymous' AND
uid != ''
GROUP BY uid) AS c1
LEFT JOIN
(SELECT uid, count(uid) AS count2
FROM points
WHERE uid != 'anonymus' AND
uid != 'anonymous' AND
uid != ''
GROUP BY uid) AS c2
ORDER BY count1 DESC
LIMIT 10;
(Apologies for syntax errors, if any - I haven't tried it out,)
I used LEFT JOIN because you are ordering by count1, so you probably
won't want any rows where count1 is null. If the total of rows from
subselect c1 was likely to be less than 10, you might want to do a FULL
JOIN and order by count1, count2.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK
http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
========================================
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To: pgsql-sql@postgresql.org
Cc: olly@lfix.co.uk, eblevins@insight.rr.com
Subject: Re: Help with SQL
In-Reply-To: <1034800739.22821.105.camel@linda>
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