select MD5('123456');//生成MD5格式 select * from table1 where in （select line1 from table2 where id=‘...’）;//级联查询 select * from table where id='1' order by id desc limit 5; select * from table where id='1' order by id asc limit 5; select * from db1.table a INNER JOIN db2.table b ON a.i ...
