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我正在使用以下查询返回记录列表：

Select DISTINCT A.Id Questionid,
  A.Created_Date Questiondate,
  Row_Number() Over ( Order By A.Created_Date Desc) Row_Id,
 B.Id Answerid,
 COUNT(*) OVER (partition by a.id) QCOUNT,
 B.Created_Date Answerdate
From Question_Table A
Inner Join Answers_Table B
ON A.Id      =  B.Question_Id
AND A.Is_Active = 1
AND A.Is_Delete = 0
And B.Is_Active = 1
And B.Is_Delete = 0 
And A.Category_Id = 1318221772

Answers_Table.question_id 映射到 question_table.id

因此，对于特定的问题 ID，answers_table 上可以有不止一行。

现在显示的输出是：

QUESTIONID QUESTIONDATE ROW_ID ANSWERID QCOUNT ANSWERDATE 

52776   08-DEC-12   1   31383   2   09-DEC-12
52776   08-DEC-12   2   31482   2   10-DEC-12
52719   07-DEC-12   3   31321   1   07-DEC-12

但我要求将输出显示为：

QUESTIONID QUESTIONDATE ROW_ID ANSWERID QCOUNT ANSWERDATE 

52776   08-DEC-12   1   31383   2   09-DEC-12
52719   07-DEC-12   3   31321   1   07-DEC-12

如何在输出中显示唯一的 questionid（如 52776,52719）？

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1 回答 1

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根据您要执行的操作，您可以使用 Group By 语句重写它。但是，如果您想保留现有查询，请尝试更改此行：

  Row_Number() Over (Order By A.Created_Date Desc) Row_Id,

对此：

  Row_Number() Over ( partition by a.id Order By B.Created_Date ASC) Row_Id,

然后使整个事情成为一个子查询，选择 where row_id = 1。这应该只返回每个问题的一行，并且只返回该问题的最早答案。

Select * From (
Select DISTINCT A.Id Questionid,
  A.Created_Date Questiondate,
  Row_Number() Over ( partition by a.id Order By B.Created_Date ASC) Row_Id,
 B.Id Answerid,
 COUNT(*) OVER (partition by a.id) QCOUNT,
 B.Created_Date Answerdate
From Question_Table A
Inner Join Answers_Table B
ON A.Id      =  B.Question_Id
AND A.Is_Active = 1
AND A.Is_Delete = 0
And B.Is_Active = 1
And B.Is_Delete = 0 
And A.Category_Id = 1318221772
) Where ROW_ID = 1
于 2013-05-01T15:46:40.440 回答