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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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