Vince Teachout wrote: > Any ideas as to why the following query returns no rows? > > SELECT claimno FROM units WHERE claimno NOT in (SELECT claimno FROM > mainlist) > > Claimno in both files is C(8), I can manually look up '07851' in Units > and find it, and manually look it up in mainlist and not find it. > (among others) > The problem turned out to be that one of the Claimnos in ClmMast was NULL. Removing it solved the problem. WHY it caused a problem, I don't know, and why it DIDN'T cause a problem with the same SELECT without the NOT keyword beats me.
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