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CREATE TABLE T1 (A INTEGER PRIMARY KEY,B INTEGER); CREATE TABLE T2 (C INTEGER,D INTEGER); INSERT INTO T1 VALUES (1, 10); INSERT INTO T2 (C, D) VALUES (null, 1); INSERT INTO T2 (C, D) VALUES (1, 1); SELECT * FROM T1; SELECT * FROM T2; select distinct A from T1 right join T2 on T1.A=T2.C;

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