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select * from BUS
  where b1 not in
    (select b1 from CONT)
  or b1 in
    (select b1 from CONT
      where c1 not in
        (select c1 from OCCU))

Joep Beckeringh



Bob Bledsoe wrote:
I have 3 files, BUS, CONT, OCCU. BUS is tied to CONT by field b1 and there
can be more the one record in CONT for each record in BUS. CONT is tied to
OCCU by field C1. What I am trying to get is all the records ib BUSS that
have NO record in OCCU. I'm totally lost as to how to do this with SQL.


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