I see...well, that's excellent. Thanks to all who responded. Reece Hart wrote: > > On Tue, 2007-05-01 at 07:38 -0700, novnov wrote: >> I didn't express myself clearly. Is there an IIF type function one can >> use >> inline in a view? >> >> SELECT UserName, IIF(mybooleanfield = true, "It's true", "It's not >> true") as >> SayIt FROM tblUser > > I think people understood you. The part that may not be obvious to you > is that case can be used in the select list, as in: > SELECT UserName, CASE mybool WHEN TRUE THEN $$It's true$$ ELSE $$It's > not true$$ END AS veracity FROM sometable; > > or even > SELECT UserName, $$It's$$ || CASE mybool WHEN TRUE THEN '' ELSE ' not' > END || ' true' AS veracity FROM sometable; > > Nearly anything you can express in a select statement can also be turned > into a view. (The only exception that comes to mind is that select > allows cols with the same name, but views don't.) > > If you really want a function, that's not hard to write for the case of > consistent types: > rkh@csb-dev=> create or replace function iif(boolean,text,text) > returns text language sql as 'select case $1 when true then $2 > else $3 end'; > CREATE FUNCTION > Time: 71.242 ms > rkh@csb-dev=> select iif(true,'yep','nope'); > iif > ----- > yep > (1 row) > > Time: 1.468 ms > rkh@csb-dev=> select iif(false,'yep','nope'); > iif > ------ > nope > (1 row) > > rkh@csb-dev=> select $$It's$$ || iif(true,'',' not') || ' true'; > ?column? > ----------- > It's true > (1 row) > > > The function is NOT declared strict: it can return null on null input. I > think that is the right behavior for the boolean, but not for the return > strings. > > -Reece > > -- > Reece Hart, http://harts.net/reece/, GPG:0x25EC91A0 > > > ---------------------------(end of broadcast)--------------------------- > TIP 9: In versions below 8.0, the planner will ignore your desire to > choose an index scan if your joining column's datatypes do not > match > > -- View this message in context: http://www.nabble.com/IF-function--tf3673523.html#a10277571 Sent from the PostgreSQL - general mailing list archive at Nabble.com.
