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And here is a sample of my Reference Table:
GroupID SubGroupID ABC RRR ABC SSS LMN TTT XYZ BBB
Basically, what I am looking for is new instances of records where the GroupID already exists in my Reference table, but the SubGroupID does not.
GroupID SubGroupID ABC RRR XYZ BBB XYZ CCC
because that is the only record where the GroupID already exists in my Reference Table, but the SubGroupID (of "SSS") does not.
GroupID SubGroupID ABC SSS
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