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CREATE TABLE a(val int); CREATE TABLE b(val int); INSERT INTO a values(1); INSERT INTO a values(3); INSERT INTO a values(5); INSERT INTO a values(7); INSERT INTO b values(3); INSERT INTO b values(10); INSERT INTO b values(7); INSERT INTO b values(9); CREATE index a_idx ON a(val); CREATE index b_idx ON b(val); explain SELECT a.val FROM a WHERE a.val IN ( SELECT b.val FROM b ); DROP TABLE a; DROP TABLE b;

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