T SQL關於分組的查詢

Question

第一個圖像是我的查詢輸出。現在我想分組這個主題，以便它變得像第二個圖像。可能嗎？謝謝您的幫助。

select Subject, Grade, case when Grade >= 50 Then '1' else '0' end as Pass, case when Grade < 50 Then '1' else '0' end as Fail from Grade_report

OUTPUT：

我要的是：

Answer 1

你的規格是不是非常精確;你對合並記錄的年級有什麼期望，應該只寫1或0還是合計通過和失敗的總和？

下將產生的輸出，它需要的傳球MAX的檔次和SUM /失敗信息：

WITH GradePassFail AS (
    SELECT 
     Subject, 
     Grade, 
     CASE WHEN Grade >= 50 THEN 1 ELSE 0 END AS Pass, 
     CASE WHEN Grade < 50 THEN 1 ELSE 0 END AS Fail 
    FROM Grade_report 
) 
SELECT Subject, MAX(Grade) AS Grade, SUM(Pass) AS Pass, SUM(Fail) AS Fail 
FROM GradePassFail 
GROUP BY Subject