Date: Fri, 29 Jun 2007 06:57:37 +0200
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: record fields as columns in reports
Message-ID: <20070629045737.GA17977@a-kretschmer.de>
References: <20070628144615.GQ72343@spoetnik.xs4all.nl>
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am  Thu, dem 28.06.2007, um 16:46:15 +0200 mailte Reinoud van Leeuwen folgendes:
> Hi everybody,
> 
> I have a script that runs every night and produces a list of a few error 
> conditions and the number.
> 
> My manager would like it in a form where he can produce some charts in a 
> spreadsheet (that's probably why he's a manager ";-).
> 
> So the table I store the errormessages in has a format like this:
> 
> CREATE TABLE repport_history
> (
>   rundate date,
>   errordescription character varying(255),
>   number bigint
> ) 
> 
> 
> And I would like an output with something like:
> 
>           06/22     06/23    06/24    06/25
> ERROR1     10         10       9         8
> ERROR2    250        300     220       200
> ERROR3      4          2       0         0
> 
> 
> (probably in csv or something like that but that is the easy part ";-)
> 
> The problems are:
> - how to create a dynamic result type? (is that possible in a stored 
> procedure?)
> - how to make sure that missing records are reported as 0
>   (some errors might not have entries on some dates)

You can do it with conditionals. Circa:

select errordescription, sum (case when rundate = '2007-06-22'::date
then number else 0 end) as "06/22", sum(case when rundate =
'2007-06-23'::date then number else 0 end) as "06/23" ... group by
errordescription order by errordescription;

and you can use a VIEW and change the fix conditions to expressions with
current_date.


Andreas
-- 
Andreas Kretschmer
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