如何处理返回select的多行选择

Question

我有两个表user_roles，它们将具有rid和uid，即用户ID和角色ID。我想从角色id中提取uid并将其输入到users表中以获取用户6.如何在sql中执行此操作？（我使用phpmyadmin从我正在迁移的项目中提取数据）.This是我试过的。

SELECT * FROM `users` WHERE uid =(select uid from `users_roles` where rid= 6 )

Answer 1

SELECT * FROM `users` WHERE uid in (select uid from `users_roles` where rid= 6 )

Answer 2

您可以使用JOIN：

SELECT u.* FROM users u
JOIN users_roles ur
    ON u.uid=ur.uid
WHERE ur.rid=6