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create table t1(i int); create table t2(j int); insert into t1 values (1); insert into t1 values (2); insert into t1 values (3); insert into t2 values (1); insert into t2 values (2); insert into t2 values (3); explain select * from t1,t2 where (i = 1 and i = j) or (j = 2 and i = j);

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