From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
---|---|
To: | Patrick Welche <prlw1(at)newn(dot)cam(dot)ac(dot)uk> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: order of clauses |
Date: | 2001-02-16 19:02:49 |
Message-ID: | Pine.BSF.4.21.0102161100570.12403-100000@megazone23.bigpanda.com |
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Thread: | |
Lists: | pgsql-general |
Well, it doesn't solve the ordering question, but you could
use a where something like this I guess:
where y>0 and (x/(case when y=0 then 1 else y end))>1
On Wed, 14 Feb 2001, Patrick Welche wrote:
> create table vals (
> x float,
> y float
> );
> insert into vals values (2,4);
> insert into vals values (2,2);
> insert into vals values (2,1);
> insert into vals values (2,0);
> select x/y from vals where y>0 and x/y>1;
>
> will give a divide by zero error as A=(y>0) and B=(x/y>1) can be evaluated in
> any order (A and B = B and A). I obviously would like (y>0) to happen first,
> but I don't see how this can be achieved.. Any ideas?
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