Date: Fri, 26 Mar 2010 07:45:29 +0100
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: Help me with this multi-table query
Message-ID: <20100326064528.GB6817@a-kretschmer.de>
References: <4BA8D216.3000802@itech7.com>
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In response to Nilesh Govindarajan :
> Hi,
> 
> I want to find out the userid, nodecount and comment count of the userid.
> 
> I'm going wrong somewhere.
> 
> Check my SQL Code-

Check my example:

test=*# select * from u;
 id
----
  1
  2
  3
(3 rows)

test=*# select * from n;
 uid
-----
   1
   1
   1
   2
   2
   3
(6 rows)

test=*# select * from c;
 uid
-----
   1
   2
   2
   3
   3
   3
(6 rows)

test=*# select foo.id, foo.n_count, count(c) from (select u.id, count(n)
as n_count from u right join n on (n.uid=u.id) group by 1) foo left join
c on foo.id=c.uid group by id, n_count;
 id | n_count | count
----+---------+-------
  1 |       3 |     1
  2 |       2 |     2
  3 |       1 |     3
(3 rows)


Andreas
-- 
Andreas Kretschmer
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