> -----Original Message----- > From: Dan Nelson [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, September 17, 2002 12:31 PM > To: Brian Reichert > Cc: Richard Unger; [EMAIL PROTECTED] > Subject: Re: aggregate functions producing bad data > > > In the last episode (Sep 17), Brian Reichert said: > > On Tue, Sep 17, 2002 at 11:59:42AM -0700, Richard Unger wrote: > > > My query: > > > > > > SELECT > > > count(id), > > > count( IF(call_end - call_start > 5, id, NULL) ), > > > count( IF(call_end - call_start <= 5, id, NULL) ) > > > FROM > > > t_calllog_calls; > > > > > > My result: > > > > > > 1994 > > > 1956 > > > 35 > > > > > > However, 1956 + 35 != 1994. > > > > > > Running MySQL 3.23.49-nt > > > > One thing I'd check: what happens if t_calllog_calls.id is NULL? > > Also check if call_end or call_start are NULL; that will > cause both IFs > to fail. Don't you love NULLs :) >
Ooh, good suggestion. I hadn't thought of that! ...but no, none of the call_start or call_end fields are NULL. Yeah, I love nulls :) Cheers, Rich --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
