什么是SQL查询

Question

我希望通过搜索role.id找出role.name，然后通过匹配他们的user_id = founded role.id

来检索所有用户

Answer 1

以下查询将有效：

select id,user_id,username from (select id from Role where name = 'provider') as t
join
user u on t.id = u.role

Answer 2

SELECT * FROM users INNER JOIN role on user.role  = role.id WHERE role.name = 'provider'