如何使用联接删除mysql行

Question

("delete from entity_map2 where canon_id in (select canon_id from 
entity_map_session2 where canon_id in (select canon_id from 
entity_map_session2 group by canon_id having count(canon_id) < 10))")

我想加快上述操作。最好的方法是什么？

Answer 1

DROP TABLE IF EXISTS table1, table2;