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CREATE TABLE R(X INT, Y INT); INSERT INTO R(X,Y) VALUES (1,1),(2,1),(3,2),(4,2); SELECT * FROM R; SELECT R1.X, R2.X FROM R AS R1 INNER JOIN R ON R1.Y=R2.Y; SELECT e.X, m.X FROM R e LEFT OUTER JOIN R m ON e.Y = m.Y;
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