From: | "Oliveiros d'Azevedo Cristina" <oliveiros(dot)cristina(at)marktest(dot)pt> |
---|---|
To: | "Mark King" <fires10(at)gmail(dot)com>, <pgsql-novice(at)postgresql(dot)org> |
Subject: | Re: can a function take a column name or is there another solution |
Date: | 2011-04-18 15:35:19 |
Message-ID: | 6B57806AD25A4B81A81A7B6EE5889601@marktestcr.marktest.pt |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-novice |
Hello!
I fail to understand what you are attempting to do.
What does your table represent and what output you expect to have..?
To my best knowledge this (select meter1 where sampledate = sampledate + interval '1 days') is not valid SQL so could you please explain in english the info
you want to obtain from your table?
Best,
Oliveiros
----- Original Message -----
From: Mark King
To: pgsql-novice(at)postgresql(dot)org
Sent: Monday, April 18, 2011 4:16 PM
Subject: [NOVICE] can a function take a column name or is there another solution
I have a table with sampledate, meter1, meter2...etc
I am trying to develop a function or query
where:
select sampledate, (meter1 - (select meter1 where sampledate = sampledate + interval '1 days')) as consumption from mytable;
Any ideas how to make this work?
Mark King
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2011-04-18 15:37:50 | Re: can a function take a column name or is there another solution |
Previous Message | Mark King | 2011-04-18 15:16:28 | can a function take a column name or is there another solution |