Re: "Flattening" query result into columns

Thanks to all for the useful replies. I chose this approach from Scott
Marlowe, which can meet the requirements I work against. Arrays seemed to
have some issues with element with null elements.
/Thomas.
-----Oprindelig meddelelse-----
Fra: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org]
På vegne af Scott Marlowe
Sendt: 22. marts 2005 01:46
Til: Thomas Borg Salling
Cc: pgsql-sql@postgresql.org
Emne: Re: [SQL] "Flattening" query result into columns

On Mon, 2005-03-21 at 15:57, Thomas Borg Salling wrote:
> I am looking for a way to ”flatten” a query result, so that rows are
> ”transposed” into columns, just as asked here for oracle:
>
>
http://groups.google.dk/groups?hl=da&lr=&client=firefox-a&rls=org.mozilla:en
-US:official&selm=aad10be0.0401292322.7b6c320b%40posting.google.com
>
>
>
> Is there any way to do this with pgsql  ?

Here's one from work that allows you to do the same basic thing without
a separate cross table:

select a.lt ,b.perspective as XYZ_pers,b.averageresponsetime as XYZ_aver,b.lowestresponsetime as
XYZ_lowe,b.highestresponsetimeas XYZ_high,b.totalcount as XYZ_tota,c.perspective as ABC_pers,c.averageresponsetime as
ABC_aver,c.lowestresponsetimeas ABC_lowe,c.highestresponsetime as ABC_high,c.totalcount as ABC_tota  
from (select distinct date_trunc('minutes', lastflushtime) as lt from
businessrequestsummarywhere lastflushtime between '2005-03-14 18:42:34' and '2005-03-21
18:42:34' and perspective in ('XYZ','ABC')
) as a
left join (select date_trunc('minutes', lastflushtime) as lt,max(perspective) as
perspective,floor(avg(averageresponsetime))as averageresponsetime,min(lowestresponsetime) as
lowestresponsetime,max(highestresponsetime)as highestresponsetime,sum(totalcount) as totalcountfrom
businessrequestsummarywhere perspective ='XYZ'group by date_trunc('minutes', lastflushtime) 
) as b
on (a.lt=b.lt)
left join (select date_trunc('minutes', lastflushtime) as lt,max(perspective) as
perspective,floor(avg(averageresponsetime))as averageresponsetime,min(lowestresponsetime) as
lowestresponsetime,max(highestresponsetime)as highestresponsetime,sum(totalcount) as totalcountfrom
businessrequestsummarywhere perspective ='ABC'group by date_trunc('minutes', lastflushtime) 
) as c
on (a.lt=c.lt)

IT's generated by a script that makes it as big as we need for all the
different perspectives.

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