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Re: Problems with substring

From: "Duncan Adams (DNS)" <duncan(dot)adams(at)vcontractor(dot)co(dot)za>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: Problems with substring
Date: 2002-09-10 15:39:37
Message-ID: 034A824BAA3FBA4CA0CBEF1031A02F350E3EDB@zablv02001.vodacom.corp (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
Thanx to u and Stuart

i was really busting my head on this one.

-----Original Message-----
From: Josh Berkus [mailto:josh(at)agliodbs(dot)com]
Sent: Tuesday, September 10, 2002 5:34 PM
To: Duncan Adams (DNS); pgsql-novice(at)postgresql(dot)org
Subject: Re: [NOVICE] Problems with substring 


> I am using postgres 7.1.3 
> on redhat 7.2.

First, please consider upgrading.   7.2.1 has a lot of enhancements
over 7.1.3, and we're testing 7.3.0 now!

> drop view wm_ups_count;
> create view wm_ups_count as
> select 
>  substring(phase from 1 for 1) as ups, 
>  sys_key, 
>  count(substring(phase from 1 for 1)) as phas_count 
> from 
>  power 
> where 
>  sys_key = 10 
> group by 
>  sys_key, 
>  phase;

This is your problem.  It should be:
GROUP BY sys_key, substring(phase from 1 for 1);

If you GROUP BY something other than the columns you are displaying,
you will often see "duplicate" rows.

-Josh Berkus

______AGLIO DATABASE SOLUTIONS___________________________

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Subject: Re: pl/pgsql and returns timestamp type
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