在 SELECT CASE SQL 中分组

Question

嗨，我有一个查询 return YES or NOT for each user now in result 我想添加 StudentId 以显示更好的结果我该怎么做？

WITH Prev AS
(
    SELECT StudentId, ISNULL(SUM(Score),0) As HighScoreUser
FROM (SELECT StudentId, Score FROM tbl_ActPoint
UNION ALL
      SELECT StudentId, Score FROM tbl_EvaPoint     WHERE Date>='1396/01/01' and Date <= '1396/01/31'
      ) as T 
      GROUP BY  StudentId
),
Cur AS 
(
    SELECT StudentId, ISNULL(SUM(Score),0) As HighScoreUser
FROM (SELECT StudentId, Score FROM tbl_ActPoint
UNION ALL
      SELECT StudentId, Score FROM tbl_EvaPoint     WHERE Date>'1396/02/01' and Date <= '1396/02/31'
      ) as T 
      GROUP BY  StudentId
)
SELECT CASE 
        WHEN(Prev.HighScoreUser <= Cur.HighScoreUser)
        THEN 'Yes'
        ELSE 'No'
        END as HaveGift
FROM Prev
INNER JOIN Cur
ON Prev.StudentId = Cur.StudentId

Answer 1

很简单。只需添加列：

SELECT CASE 
        WHEN(Prev.HighScoreUser <= Cur.HighScoreUser)
        THEN 'Yes'
        ELSE 'No'
        END as HaveGift,
        Prev.StudentId
FROM Prev
INNER JOIN Cur
ON Prev.StudentId = Cur.StudentId

在 SELECT CASE SQL 中分组

Group BY in SELECT CASE SQL

tsql

sql-server

select

group-by

select-case