Skip site navigation (1) Skip section navigation (2)

Re: join/group/count query.

From: Gary Stainburn <gary(dot)stainburn(at)ringways(dot)co(dot)uk>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: join/group/count query.
Date: 2006-12-21 09:46:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-sql
On Wednesday 20 December 2006 18:06, Hector Villarreal wrote:
> HI in reading this is it possible what was really intended :
> Sum(case when o_model = 5 then 1 else NULL end) as KA
> That would provide a count of all records meeting that condition.
> Otherwise the count( approach will not do that.

Because the else is NULL, count does work. Although I would imagine sum will 
also work, count more reflects the logic, i.e. the number of times that 
condition is true
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000     

In response to

pgsql-sql by date

Next:From: Alexis Paul BertoliniDate: 2006-12-22 23:12:16
Subject: Changing character set when the damage is done
Previous:From: Sandip GDate: 2006-12-21 07:41:33

Privacy Policy | About PostgreSQL
Copyright © 1996-2018 The PostgreSQL Global Development Group