> The problem is that I don't want more than one row in the table that has > a null value in the column. As you've pointed out in your e-mail, > there's a difference between NULL and BLANK. It's not that I don't want > NULL values, it's that I don't want MORE THAN ONE.
I can easily continue arguing about this ... :-) NULL is not a value. There's no such thing as a "null value". NULL is a state. NOT NULL is a state. That's the two possible states of a column. Why do you allow NULL, in this case? And what does it mean? With regards, Martijn Tonies Database Workbench - developer tool for InterBase, Firebird, MySQL & MS SQL Server Upscene Productions http://www.upscene.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
