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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); explain select a.val from a where not exists ( select 1 from b where a.val = b.val ); DROP TABLE a; DROP TABLE b;

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