我有以下两个表:
测验表:
QuizNo | Status
1 Reviewed
2 Not Reviewed
测验回应表:
QuizNo | QuestionID | Response
1 11 Yes
2 13 No
2 11 Yes
1 13 No
这是预期的结果(11和13是问题ID):
QuizNo | Status | 11 | 13
1 Reviewed Yes No
2 Not Reviewed Yes No
这是我当前的查询,无法正常运行:
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT ',' + QUOTENAME(QuestionID)
from Quiz
INNER JOIN QuizResponse x ON QuizNo = x.QuizNo
group by QuestionID, QuizNo
order by QuestionID
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)') ,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
select QuestionID
from QuizResponse
) x
pivot
(
max(QuestionID)
for QuestionID in (' + @cols + N')
) p '
exec sp_executesql @query;
您将如何完成/更改查询以获得预期结果?
TIA!
您已经很接近了,但是在完成查询之前还需要一些注意事项。
Stuff函数中的查询需要同时使用表别名指定两个QuizNo。它也不应按QuizID分组,否则您将得到重复的列定义(每个QuestionID为11的QuizID为[11])。因此整理了这个小组。
最后,更新动态SQL以选择不被透视的列,并选择max(Response)而不是QuestionID作为每个单元格的数据。
请参见SQLFiddle示例。
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT ',' + QUOTENAME(QuestionID)
from Quiz Q
INNER JOIN QuizResponse x ON Q.QuizNo = x.QuizNo
GROUP BY QuestionID
ORDER BY QuestionID
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)') ,1,1,'')
set @query = N'SELECT QuizNo, [Status], ' + @cols + N' from
(
select QR.QuizNo, Q.[Status], QR.QuestionID, QR.Response
from QuizResponse QR
inner join Quiz Q on QR.QuizNo = Q.QuizNo
) x
pivot
(
max(Response)
for QuestionID in (' + @cols + N')
) p '
exec sp_executesql @query;
本文收集自互联网,转载请注明来源。
如有侵权,请联系 [email protected] 删除。
我来说两句