MySQL从涉及的表中选择

Question

我有两张桌子。
一个表看起来像：user（id，username）
另一个表看起来像：rating（user_id，rating）

现在我想选择查找前10名评分用户：

SELECT *
FROM rating order by rating
LIMIT 10;

现在我想“切换”到用户名并显示前10个ID中的用户名。

我怎么能这样做？

Answer 1

SELECT u.username,r.rating
FROM user u
INNER JOIN rating r ON u.id = r.user_id
ORDER BY r.rating DESC
LIMIT 10;

Answer 2

SELECT u.username, r.rating
FROM rating as r, user as u 
WHERE r.user_id = u.id 
ORDER BY r.rating DESC 
LIMIT 10;

Answer 3

尝试此查询

SELECT user.username，rating.rating     来自用户     LEFT JOIN等级为user.id = rating.user_id     ORDER BY rating.rating DESC     限制10;