--CELKO-- wrote:
> SELECT a1, a2, a3, a4
> FROM A
> WHERE NOT EXISTS
> (SELECT *
> FROM B
> WHERE A.a1 = B.b1
> AND A.a2 = B.b2
> AND A.a3 = B.b3
> AND A.a4*= B.b4 );


Yeah, that works better than my version. I just tested a little more
and realized that mine doesn't actually do what I expected, but I can't
figure out why not.

--Richard