On Wed, Nov 02, 2005 at 06:30:51PM -0500, [EMAIL PROTECTED] wrote: > In a CHECK constraint, if the expression is NULL (neither true > nor false) does the constraint fail?
At least in Oracle, no, your example insert works fine. If you want the insert to fail, you need to add a "not null" constraint as well. Nulls are always allowed unless you have a not null constraint. I'm not certain, but I believe this is standard behavior in all SQL RDBMSs that support constraints, not just Oracle. -- Andrew Piskorski <[EMAIL PROTECTED]> http://www.piskorski.com/
