Re: Function in selection?

May,
    I think this is what you want.

SELECT CASE WHEN A=0 and B<>0 THEN B*Z.TABLE_Y ELSE A END AS A, CASE WHEN
A<>0 AND B=0 THEN A/Z.TABLE_Y ELSE B END AS B FROM TABLE_X ORDER BY D, C, E

Thanks,
Peter Darley

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org]On Behalf Of Dousak May
(Phoebus Apollonus)
Sent: Thursday, March 13, 2003 10:56 AM
To: pgsql-general@postgresql.org
Subject: [GENERAL] Function in selection?


Hi, I want to make really advanced query and I'm not sure it's
possible... it would be "like that":

select A, B, C, D, E, F from TABLE_X ORDER BY D, C, E
  if A==0 AND B!=0 {A=B*Z.TABLE_Y}
  if A!=0 AND B==0 {B=A/Z.TABLE_Y}

OK, I don't really have problems with first line :), but how can I tell
him to select like the second and third line are telling it?
is that possible? :/

Tnx,

May



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