Hello, Use a view
Regards ________________________________ From: Janek Sendrowski <jane...@web.de> To: pgsql-general@postgresql.org Sent: Friday, August 16, 2013 11:55 AM Subject: Re: [GENERAL] devide and summarize sql result (all) Thanks for your Answers, my problem is, that there is no column with the name 'percentage'. It's just a result of my query. So how can I use it anyway? Should I just store the result in a record variable and do another query? Janek Gesendet: Freitag, 16. August 2013 um 00:24 Uhr Von: bricklen <brick...@gmail.com> An: "Janek Sendrowski" <jane...@web.de> Cc: "pgsql-general@postgresql.org" <pgsql-general@postgresql.org> Betreff: Re: [GENERAL] devide and summarize sql result (all) On Thu, Aug 15, 2013 at 1:51 PM, Janek Sendrowski <jane...@web.de> wrote: Hi, > >My sql query results sth. like this: > >user percentage >franz 78% >smith 98% >franz 81% >jason 79% >smith 89% >smith 85% >smith 99% > >Now I'd like to summarize the percentages oder every user like this. >smith >2 matches 95-100% >2 matches 85-95% >0 mathes 75-85% > >franz >0 mathes 95-100% >... A CASE statement should work, if you are willing to hard-code the list of expressions. SELECT username, sum(case when avg between 76 and 85 then 1 else 0 end) as "76 to 85", sum(case when avg between 86 and 95 then 1 else 0 end) as "86 to 95", sum(case when avg > 95 then 1 else 0 end) as ">95" FROM yourtable GROUP BY username
