SQL Take Max and Include Non-Group By COLS答案

【问题标题】：SQL Take Max and Include Non-Group By COLSSQL Take Max and Include Non-Group By COLS
【发布时间】：2022-12-23 23:18:58
【问题描述】：

TABLE1
ID  STUDENT SCORE   TIME
A   1   9   1
A   1   8   2
B   1   0   1
B   1   10  2
B   1   7   3
C   2   5   1
C   2   1   2
C   2   0   3
D   3   1   1
E   3   0   1
D   3   4   2
D   3   4   3
E   3   9   2
            
            
            
            
            
            
            
WANT
ID  STUDENT MAXSCORE    TIME
A   1   9   1
B   1   10  2
B   1   7   3
C   2   5   1
C   2   1   2
C   2   0   3
D   3   1   1
E   3   9   2
D   3   4   3

我有 TABLE1 并希望 WANT 这样做：对于每个学生/时间，选择具有 MAX(SCORE) 的行

我试试这个::

select ID, STUDENT, MAX(SCORE) AS MAXSCORE, TIME
from TABLE1
group by STUDENT, TIME

但无法包含 ID

【问题讨论】：

标签： sql group-by

【解决方案1】：

首先按学生/时间获得最高分数，然后返回原始表。

WITH dat
AS
(
SELECT student, time, MAX(score) AS max_score
FROM TABLE1
GROUP BY student, time
)
SELECT t.*
FROM TABLE1 t
INNER JOIN dat d 
ON t.student = d.student AND t.time = d.time AND t.score = d.max_score;

【讨论】：