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Pairs
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CREATE TABLE Pairs(Id varchar(5), Name varchar(20)); INSERT INTO Pairs VALUES ('a','ZZZZZZZZ'), ('b','YYYYYYYY'), ('c','WWWWWWWW'), ('d','ZZZZZZZZ'), ('e','YYYYYYYY'), ('f','WWWWWWWW'); ;WITH Pair AS ( SELECT CASE WHEN p1.Id > p2.Id THEN p2.Id ELSE p1.Id END as ID, CASE WHEN p1.Id > p2.Id THEN p1.Id ELSE p2.Id END as ID2, p1.Name FROM Pairs p1 LEFT JOIN Pairs p2 ON p1.Name = p2.Name AND p1.Id <> p2.Id ) SELECT DISTINCT ID, ID2, Name FROM Pair; DROP TABLE Pairs;
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Execution time: 0,02 sec, rows selected: 3, rows affected: 6, absolute service time: 0,16 sec
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