Use the ROUND statement ROUND(sum(CLICKS),sum(IMPS)/sum(CLICKS)*100.0,0),2);
-----Original Message----- From: David Garamond [mailto:davegaramond@;icqmail.com] Sent: Sunday, November 03, 2002 2:31 AM To: [EMAIL PROTECTED] Subject: rounding behaviour hi, mysql> select 1/29; +------+ | 1/29 | +------+ | 0.03 | +------+ 1 row in set (0.00 sec) mysql> select 100.0*1/29; +------------+ | 100.0*1/29 | +------------+ | 3.448 | +------------+ 1 row in set (0.00 sec) mysql> select 1/29*100.0; +------------+ | 1/29*100.0 | +------------+ | 3.45 | +------------+ 1 row in set (0.00 sec) i am slightly puzzled by mysql's behaviour in the first case. this seems to be a float division, but why does mysql rounds it to two digits after decimal? if this is supposed to be an integer division, wouldn't it be better/more predictable for mysql to return 0? this behaviour could cause subtle problem/errors because people really didn't expect this kind of behaviour. for example, i just found out today, after weeks of operation, that my sql expression: SELECT ...,if(sum(CLICKS),sum(IMPS)/sum(CLICKS)*100.0,0) as CTR FROM T generates CTR that are rounded to two digits after decimal (yes, IMPS and CLICKS are integer fields). however, after i change the expression to this: SELECT ...,if(sum(CLICKS),100.0*sum(IMPS)/sum(CLICKS),0) as CTR FROM T all is well. -- dave --------------------------------------------------------------------- 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 --------------------------------------------------------------------- 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
