小编典典

在SQL Server中将行转置/旋转到列

sql

我有三个表格-第一个表格包含具有唯一ID的问题

QID     | Question  
------------------  
1       | Question 1  
2       | Question 2  
3       | Question 3  
4       | Question 4  
5       | Question 5

第二个包含这些问题的答案,第一个表中的唯一ID,然后是将答案链接在一起的记录的ID

QID     | Answer | Parent
-------------------------
1       | Yes    | 123
2       | No     | 123  
3       | No     | 123  
4       | Yes    | 123  
5       | Yes    | 123
1       | No     | 124
2       | Yes    | 124  
3       | No     | 124  
4       | No     | 124  
5       | No     | 124

第三个包含有关父级的其他信息

Parent     |      Parent Title
----------------------------------------
123        |      Questionnaire Sample 1
124        |      Questionnaire Sample 2

理想情况下,我想创建一个将数据转置或旋转为更可用格式的视图,我在考虑以下方面:

Parent     | Question 1     | Question 2     | Question 3     | Question 4     | Question 5
123        | Yes            | No             | No             | Yes            | Yes
124        | No             | Yes            | No             | No             | No

我从以下内容中提取了以下内容:

SELECT [First_Set], [Second_Set]
FROM
(
  SELECT B.ColumnName, A.Value
    , row_number() over(partition by a.Table2ID
                    order by a.Value) seq
  FROM Table_1 AS A 
  INNER JOIN Table_2 AS B 
    ON A.Table2ID = B.ID
) AS P
PIVOT
(
  min(P.Value)
  for P.ColumnName in ([First_Set], [Second_Set])
) AS PIV;

然后,我将其修改为:

SELECT [PARENT], [QUESTION], [ANSWER]
FROM
(
  SELECT B.PARENT_TITLE, C.QUESTION, A.ANSWER
    , row_number() over(partition by a.PARENT
                        order by a.PARENT) seq
  FROM answerTable AS A 
  INNER JOIN parentTable AS B 
    ON A.PARENT = B.PARENT
  INNER JOIN questionTable AS C 
    ON A.QID = C.QID    
) AS P
PIVOT
(
  min(P.RESULT)
  for P.PARENT in ([PARENT], [QUESTION], [ANSWER])
) AS PIV;

哪个返回但仍然不是我需要的。

对我而言,创建新表是不可行的,因此理想情况下,我正在这里寻找一种动态手段,这是为了进行报告,因此我认为视图最简单/最佳,但我愿意接受建议。

谢谢。


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2021-05-16

共1个答案

小编典典

以下是动态执行操作的方法:

create table #t1(QID int, Question char(10))
insert #t1 values
(1, 'Question 1'),  
(2, 'Question 2'),  
(3, 'Question 3'),  
(4, 'Question 4'),  
(5, 'Question 5')

create table #t2 (QID int, Answer char(3), Parent int)
insert #t2 values 
(1,        'Yes',    123),
(2,        'No ',    123),  
(3,        'No ',    123),  
(4,        'Yes',    123),  
(5,        'Yes',    123),
(1,        'No ',    124),
(2,        'Yes',    124),  
(3,        'No ',    124),  
(4,        'No ',    124),  
(5,        'No ',    124)

declare @collist nvarchar(max)
SET @collist = stuff((select distinct ',' + QUOTENAME(Question) 
            FROM #t1 -- your table here
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')
select @collist

declare @q nvarchar(max)
set @q = '
select * 
from (
    select 
    Question, Answer, Parent
        from (
        select #t1.*, #t2.Answer, #t2.parent
        from #t1
        inner join #t2 on #t1.QID = #t2.QID
    ) as x
) as source
pivot (
    max(Answer)
    for Question in (' + @collist + ')
) as pvt
'

exec (@q)
2021-05-16