Paul DuBois writes:
> NULL basically means "unknown value", so saying WHERE x = NULL cannot > work, even if x is NULL. That means "where one unknown value = another > unknown value", which cannot be evaluated with any certainty. :-) It is sort of odd, though, that x = NULL returns something which appears to be undefined rather than something well-defined (such as false all the time) or an error (which could be said to be well-defined, if errors are considered to be valid responses to queries...). //C -- Carl Troein - Círdan / Istari-PixelMagic - UIN 16353280 [EMAIL PROTECTED] | http://pixelmagic.dyndns.org/~cirdan/ Amiga user since '89, and damned proud of it too. sql, database, damned crap, grrr... --------------------------------------------------------------------- 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
