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create table tbl ( id int, num1 int, num2 int ); insert into tbl values (1, 10, 30), (2, 99, 72), (3, 60, 84), (4, 70, 66), (5, 80, 37), (6, 30, 10); select tbl1.* from tbl tbl1 join tbl tbl2 on tbl1.num1 = tbl2.num2 and tbl1.num2 = tbl2.num1 where tbl2.id < tbl1.id ;
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