I\'m having a problem getting a query to work, which I think should work. It\'s in the form
SELECT DISTINCT a, b, c FROM t1 WHERE NOT IN ( SELECT DISTINCT a,b,c
Well, I'm going to answer my own question, in spite of all the great advice others gave.
Here's the proper syntax for what I was trying to do.
SELECT DISTINCT a, b, c FROM t1 WHERE (a,b,c) NOT IN ( SELECT DISTINCT a,b,c FROM t2 )
Can't vouch for the efficiency of it, but the broader questions I was implicitly putting was "How do I express this thought in SQL", not "How do I get a particular result set". I know that's unfair to everyone who took a stab, sorry!