Re: record fields as columns in reports

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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