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Developer-C 11.1
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WITH tableA AS ( SELECT 'ab' AS Product, 'vb' AS Variant, 'a1' AS Part, '1' AS [Order] UNION ALL SELECT 'ab', 'vb', 'a2', '1' UNION ALL SELECT 'ab', 'vb', 'a3', '2a' UNION ALL SELECT 'ab', 'vb', 'a4', '3' UNION ALL SELECT 'ab', 'vb', 'a5', '4.1' ) SELECT Product, Variant, Part, [Order] FROM tableA a1 WHERE EXISTS (SELECT 1 FROM tableA a2 WHERE a2.Product = a1.Product AND a2.Variant = a1.Variant AND a2.[Order] = a1.[Order] AND a2.Part <> a1.Part);
Product
Variant
Part
Order
ab
vb
a1
1
ab
vb
a2
1