Re: Adding UNIQUE constraint on NULL column

Dave Smith <dave.smith@candata.com> writes:

> I am trying to add a unique constraint on a column that can be null. The
> documentation states that null is treated as non equal values but I want
> them to be equal. Is there another way of doing this other than writing
> a before insert trigger?

UNIQUE constraints on NULLable columns work fine.  It's not clear from
the above what you're looking for.

Are you really saying that you want 'NULL = NULL' to return 't'?

-Doug