Re: "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.highestresponsetime as XYZ_high,b.totalcount as XYZ_tota,c.perspective as ABC_pers,c.averageresponsetime as ABC_aver,c.lowestresponsetime as 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 businessrequestsummary where 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 businessrequestsummary where 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.