From: | Ian Barwick <barwick(at)gmx(dot)net> |
---|---|
To: | Jakub Ouhrabka <jouh8664(at)ss1000(dot)ms(dot)mff(dot)cuni(dot)cz> |
Cc: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: difficult query |
Date: | 2002-05-04 18:19:34 |
Message-ID: | 200205042019.34265.barwick@gmx.net |
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Thread: | |
Lists: | pgsql-sql |
On Saturday 04 May 2002 19:34, Jakub Ouhrabka wrote:
> > > Is it possible to do this in sql?
> >
> > Basically, no. (You might be able to do it with the help
> > of a user-defined function though).
> >
> > Why do you want to do this?
>
> I'm curious. I've been on a sql course long time ago where the tutor
> mentioned similiar problem as something special for sql smarties... And
> yesterday when I faced this problem (which can be solved perfectly with
> the outer join) I wasn't able to remember the solution... If there is
> any... Just out of curiosity...
well, you could do it like this I suppose:
SELECT 1 AS day, COUNT(data) FROM table1 WHERE day=1
UNION
SELECT 2, COUNT(data) FROM table1 WHERE day=2
UNION
SELECT 3, COUNT(data) FROM table1 WHERE day=3
UNION
SELECT 4, COUNT(data) FROM table1 WHERE day=4
(and so on ad infinitum)
although I expect E.F. Codd will be turning in his grave ;-)
Ian Barwick
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