A colleague asked me what was wrong with this query: mysql> select user.id, email, count(click.id) as c from user, click where when_signup >= '2002-11-10' and click.user_id = user.id group by c;
ERROR 1056: Can't group on 'c' Of course, it's logically impossible to group by the result of an expression involving an aggregate function and my colleague certainly knows better -- he just spaced out a bit. That said, the error message here wasn't useful in helping him to diagnose the problem. It would have been far more useful for the error message to be more clear about *why* one cannot group on 'c'. -JF --------------------------------------------------------------------- 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
