Hello, I have a data set, that looks like a change log. Each document number can have 30-50 lines but the document code can be different on each line. Example below... How can I say I want Document numbers that do not have Document cd DEF but do have document code EFG? Document Cd Document number ABC 103013013013 BCD 103013013013 EFG 103013013013 ABC 103013013013 QRS 103013013013 QRS 103013013013 ABC 103013013013 DEF 103013013013
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