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WITH imp_source AS ( SELECT 5 AS Product, 5 AS class, 1 AS seq FROM dual UNION ALL SELECT 5, 3, 2 FROM dual UNION ALL SELECT 5, 16, 3 FROM dual UNION ALL SELECT 8, 1, 1 FROM dual UNION ALL SELECT 8, 4, 2 FROM dual ), imp_update AS ( SELECT 5 AS Product, 6 AS class, 4 AS seq FROM dual UNION ALL SELECT 8, 1, 6 FROM dual UNION ALL SELECT 8, 4, 2 FROM dual UNION ALL SELECT 8, 23, 3 FROM dual UNION ALL SELECT 9, 3, 1 FROM dual ) SELECT s.Product, s.class, s.seq FROM imp_source s WHERE NOT EXISTS (SELECT 1 FROM imp_update u WHERE u.Product = s.Product AND u.class = s.class) UNION ALL SELECT Product, class, seq FROM imp_update ORDER BY Product;
PRODUCT
CLASS
SEQ
5
16
3
5
3
2
5
5
1
5
6
4
8
1
6
8
4
2
8
23
3
9
3
1