简单的inner join连表查询

use filemaneger;

select roleid from userrole a inner join(select id from usertable where username='user' and password='e10adc3949ba59abbe56e057f20f883e')b on a.userid=b.id

select operateid from roleoperate c inner join(
select roleid from userrole a inner join(select id from usertable where username='user' and password='e10adc3949ba59abbe56e057f20f883e')b on a.userid=b.id)d 
on d.roleid=c.roleid