如何将一个查询结果作为同一表中的参数传递给多个查询，以及如何在sql中获取所有列

Question

SELECT 
    Subjects, Sec1, Sec2, Sec3, Sec4, Sec5, Sec6, Sec7, Sec8 
FROM
    (SELECT DISTINCT SubjectId AS Subjects 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem='8') q1,
    (SELECT SUM(StarValue) AS Sec1 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (1, 2, 3, 4, 5, 6)) q2,
    (SELECT SUM(StarValue) AS Sec2 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (7, 8, 9)) q3,
    (SELECT SUM(StarValue) AS Sec3 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (10)) q4,
    (SELECT SUM(StarValue) AS Sec4 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (11)) q5,
    (SELECT SUM(StarValue) AS Sec5 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (12, 13)) q6,
    (SELECT SUM(StarValue) AS Sec6 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (14)) q7,
    (SELECT SUM(StarValue) AS Sec7 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (15)) q8,
    (SELECT SUM(StarValue) AS Sec8 
     FROM Feedback 
     WHERE StudentId LIKE '%BIT%' AND Sem = '8' AND QuestionId IN (16, 17, 18, 19, 20)) q9

在这里，我想计算特定部门和学期中每个科目的starvalue值总和。 但是，我不知道如何传递从上面的query（q1）中获取的subjectid 。

Feedback表的架构为：

StudentId varchar(50)
Sem int
SubjectId varchar(50)
QuestionId int
StarValue int
Date datetime

下面的查询将执行sec1的结果，但我不知道如何执行其他部分查询并将结果合并为单行。

SELECT DISTINCT 
    SubjectId, SUM(StarValue) AS Sec1 
FROM Feedback 
WHERE (1 = 1) 
  AND StudentId LIKE '%BIT%' 
  AND Sem = '8' 
  AND QuestionId IN (1, 2, 3, 4, 5, 6) 
GROUP BY SubjectId

这是第1节的确切结果。 我希望根据科目和学期将这些内容输出到每个科目：

Answer 1

您可以只应用谓词来过滤聚合函数中的问题，并使用单个表进行读取：

SELECT  SubjectID,
        Sec1 = SUM(CASE WHEN QuestionID IN (1, 2, 3, 4, 5, 6) THEN StarValue END),
        Sec2 = SUM(CASE WHEN QuestionID IN (7, 8, 9) THEN StarValue END),
        Sec3 = SUM(CASE WHEN QuestionID IN (10) THEN StarValue END),
        Sec4 = SUM(CASE WHEN QuestionID IN (11) THEN StarValue END),
        Sec5 = SUM(CASE WHEN QuestionID IN (12, 13) THEN StarValue END),
        Sec6 = SUM(CASE WHEN QuestionID IN (14) THEN StarValue END),
        Sec7 = SUM(CASE WHEN QuestionID IN (15) THEN StarValue END),
        Sec8 = SUM(CASE WHEN QuestionID IN (16, 17, 18, 19, 20) THEN StarValue END)
FROM    Feedback
WHERE   StudentID LIKE '%BIT%'
AND     Sem = '8'
GROUP BY SubjectID;