LeetCode（数据库）- 每位学生的最高成绩

题目链接：​​点击打开链接​​

题目大意：略。

解题思路：略。

AC 代码

SELECT student_id, course_id, grade 
FROM (SELECT *, ROW_NUMBER() OVER(PARTITION BY student_id ORDER BY grade DESC, course_id) rw FROM Enrollments) rs
WHERE rw = 1
ORDER BY student_id