Hi,
I agree with you.
From the reference
"If the value of test_expression/subquery is equal to any value returned by subquery or is equal to any expression from the comma-separated list, the result value is TRUE; otherwise, the result value is FALSE" - so the result UNKNOWN seems to be covered (or explained) by FALSE.
Alright, next time I'll try not to miss some things like this one.
Thanks
Igor Micev,My blog: www.igormicev.com