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explain select 1 from t2 where c2 in (select 1 from t3, t2) and c1 in (select convert(c6,char(1)) from t2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 1 Using where
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359
3 SUBQUERY t2 ALL NULL NULL NULL NULL 1