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When I execute “sp_help tableName” I see a constraint where it says ‘Primary Key (clustered)’, and it lists three columns under the header ‘constraint_keys’.
Does that mean that any one of those column values will uniquely identify the row, or that the values of all three columns together uniquely identify the row?
It means that all three columns combine to make a unique row. Any individual column can have duplicates as long as the combination is unique.