Re: [PHP-DB] MySQL Query Question
Jeremy, This question probably should be posted to the MySql mailing list but here goes. Take a look at this link: http://www.mysql.com/doc/en/Where_optimisations.html Your example was not very explicit so I am not sure, but I believe you are in need of a WHERE clause. For example; Select a, b, c where a 7 and c 0 This should get you going in the right direction. At 03:29 PM 1/23/03 -0600, Jeremy wrote: Hello, I need some help from you MySQL gurus out there. This is pure SQL by the way..no front-end. Lets say you have a table that has 2columns.columnA, ColumnB and columnC I have something like this if (columnA'7', (columnB/columnC) + 52, columnB/ColumnC) as Number however i need to test if columnc is 0 also cause if i need divide by zero i get a null value I cant figure out how to do this any help would be greatly appreciated -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] MySQL Query Question
It is safe to test if the divisor is zero: replace columnB/columnC by IF( columnC = 0, 0, columnB/columnC ) (the 0 could be anything else; this depends on your business logic) Ignatius - Original Message - From: Jeremy [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, January 23, 2003 10:29 PM Subject: [PHP-DB] MySQL Query Question Hello, I need some help from you MySQL gurus out there. This is pure SQL by the way..no front-end. Lets say you have a table that has 2columns.columnA, ColumnB and columnC I have something like this if (columnA'7', (columnB/columnC) + 52, columnB/ColumnC) as Number however i need to test if columnc is 0 also cause if i need divide by zero i get a null value I cant figure out how to do this any help would be greatly appreciated -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] MySQL Query Question
I need some help from you MySQL gurus out there. This is pure SQL by the way..no front-end. Lets say you have a table that has 2columns.columnA, ColumnB and columnC I have something like this Oh CRAP! You lost me... you said two columns but listed 3! ;) if (columnA'7', (columnB/columnC) + 52, columnB/ColumnC) as Number I think someone already suggested these, but either include a WHERE c != 0 in your WHERE clause (if you don't want those rows), or use a nested IF() to return a specific value when C is zero: IF(ColumnC=0,'Undef',IF(ColumnA7,ColumnB/ColumnC+52,ColumnB/ColumnC)) ---John W. Holmes... PHP Architect - A monthly magazine for PHP Professionals. Get your copy today. http://www.phparch.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
