表users 字段 userid,departid,username 记录10000表depart 字段 departid departname 记录1000000双表查询查询1,select * from users as a,depart as b where a.departid=b.departid
查询2,select * from depart as a,users as b where a.departid=b.departid查询3 select * from users as a join depart as b on a.departid=b.departid哪种快呢
查询2,select * from depart as a,users as b where a.departid=b.departid查询3 select * from users as a join depart as b on a.departid=b.departid哪种快呢
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