MySQL - WHERE 子句 + JOIN

Question

我有以下 MySQL 查询：

SELECT user_id, score, time 
FROM tests_1 T
WHERE T.score = (
SELECT MAX(T2.score)
FROM tests_1 T2
WHERE T2.user_id = T.user_id
)
ORDER BY score DESC, time ASC;

如何在 users.user_id = tests_1.user_id 上添加“用户”表中的“用户名”列？

Answer 1

试试这个：

SELECT T.user_id, U.username, T.score, T.time 
FROM tests_1 T
JOIN users U on U.user_id = T.user_id
WHERE T.score = (
SELECT MAX(T2.score)
FROM tests_1 T2
WHERE T2.user_id = T.user_id
)
ORDER BY T.score DESC, T.time ASC;

Answer 2

加入吧。

SELECT T.user_id, T.score, T.time, u.username
FROM tests_1 T
JOIN users u ON u.user_id = T.user_id
WHERE T.score = (
SELECT MAX(T2.score)
FROM tests_1 T2
WHERE T2.user_id = T.user_id
)
ORDER BY T.score DESC, T.time ASC;

Answer 3

SELECT user_id, score, time, U.username
FROM tests_1 T JOIN users U
    ON T.user_id = U.user_id
WHERE T.score = (
    SELECT MAX(T2.score)
    FROM tests_1 T2
    WHERE T2.user_id = T.user_id
)
ORDER BY score DESC, time ASC;