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spirose

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SQL - no duplicate row of combination of ColumnA and ColumnB

This query is for quality check on a TableAB- query checks that there is no duplicate row with the same values of ColumnA and ColumnB.
Example:
ColumnA                    ColumnB              ColumnC             ColumnD
2                                   6                     22                   23
2                                   6                     26                    42

This case above should not happen. The query needs to return such records if they exist.
ASKER CERTIFIED SOLUTION
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Patrick Matthews
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spirose

ASKER

Works great- thank you.