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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from (`test`.`t10` join `test`.`t12`) join `test`.`t1` where ((`test`.`t10`.`pk` = `test`.`t1`.`a`) and (`test`.`t12`.`pk` = `test`.`t10`.`a`))
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subqueries within outer joins go into ON expr.
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explain extended select * from t1 where a in (select pk from t10 where pk<3);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 103 100.00 Using where