使用多连接更新sql表

Question

我有下面的SQL语句从多个表中提取数据，可以看出在tblquestions中章节Id为空我想知道如何更新表，以便它显示正在的章节id来自问题表中匹配的部分ID

反过来我想更新tblQuestions，使用chapterId，其中Id部分等于section section的部分

select chap.chapterID , sec.sectionID, q.ChapterId , q.sectionID from tblChapters as chap
left join tblSections as sec on chap.chapterID = sec.chapterID
left join tblQuestions as q on chap.subjectID = q.subjectID
where chap.subjectID  = 363
group by chap.chapterID, sec.sectionID, q.ChapterId , q.sectionID 

输出

chapterID   sectionID   ChapterId   sectionID
22266       4869        NULL         4869

Tbl章节

chapterID
subjectID
chapterNo
Title
cssID
OldChapterId

tbl sections

sectionID
chapterID
sectionNO
Title
cssID
oldSecId

tblQuestions

 questionID
QuestionType
QuestionNo
question
A
B
C
D
correctAnswer
explanation
bookRef
sectionID
subjectID
syllabusRef
noChapSec
ChapterId
oldChapIf
OldSubID
oldSecId

Answer 1

您可以尝试这样： -

   update q
set q.ChapterId=t.chapterID
from tblQuestions q Join (
select chap.chapterID , sec.sectionID, q.ChapterId , q.sectionID from tblChapters as chap
left join tblSections as sec on chap.chapterID = sec.chapterID
left join tblQuestions as q on chap.subjectID = q.subjectID
where chap.subjectID  = 363
group by chap.chapterID, sec.sectionID, q.ChapterId , q.sectionID )t on t.sectionID=q.sectionID

Answer 2

试试这个......

UPDATE  tblQuestions q
    SET   q.ChapterId  =  (

    SELECT sec .ChapterId  
    from tblSections sec 
    INNER JOIN tblChapters chap on chap.chapterID = sec.chapterID
    WHERE chap.subjectID = q.subjectID

    )

    WHERE q.ChapterId  IS NULL

Answer 3

UPDATE q SET q.ChapterID = chap.ChapterID
FROM tblQuestions q
INNER JOIN tblChapters  chap
ON chap.subjectID = q.subjectID
WHERE q.ChapterId  IS NULL