On 9 Jan 2003, at 10:29, Meena Vyavahare wrote: > Select col1, col2, count(*) as total, count(col3 < col4) as violations > from table1 > Where condn > group by col1, col2 > > The result of this query shows same values at both the columns for total > and violations. > The count(expr) does not work????
You're misunderstanding how COUNT() works. Since the expression (col3 < col4) is never null, counting it is the same as counting the number of rows. See the documentation: http://www.mysql.com/doc/en/Group_by_functions.html In this situation you might use SUM() instead, since the inequality evaluates to either 0 or 1 in numeric context. -- Keith C. Ivey <[EMAIL PROTECTED]> Tobacco Documents Online http://tobaccodocuments.org Phone 202-667-6653 --------------------------------------------------------------------- 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
