如何遍历 SQL 服务器数据透视查询

Question

在开始阅读之前，如果下面的解释太长，您将不会阅读下面的代码。

请您覆盖它，只看最后一行。

我有这个使用游标的正常循环查询，效果很好。

DECLARE db_cursor CURSOR FOR 
    Select top 100 percent
        [students].stu_id as StuID, Major_ID,MajorSeq,
        SysDate, Points
    From 
        [dbo].[StudentRegsterations] 
    inner join 
        [dbo].[students] on [dbo].[StudentRegsterations].Stu_ID = [dbo].[students].stu_id 
    order by 
        [Points] desc, [SysDate] desc;

DECLARE @StuID [int];
DECLARE @Major_ID [int];
DECLARE @MajorSeq [int];
DECLARE @SysDate [date];
DECLARE @Points [decimal](10, 2);

OPEN db_cursor;
FETCH NEXT FROM db_cursor INTO @StuID, @Major_ID, @MajorSeq, @SysDate, @Points;

WHILE @@FETCH_STATUS = 0
BEGIN
   --Do stuff with scalar values
   --InsertThisStudent()
   print CAST(@Points as varchar(10)) + '  -  ' + CAST(@SysDate as varchar(20))

   FETCH NEXT FROM db_cursor INTO @StuID, @Major_ID, @MajorSeq, @SysDate, @Points;
END;

CLOSE db_cursor;
DEALLOCATE db_cursor;

以上循环查询抛出正常选择。

但是，如果我将其更改为数据透视查询，则会出现以下错误。

Msg 16924, Level 16, State 1, Line 31
Cursorfetch: The number of variables declared in the INTO list must match that of selected columns.

导致错误的数据透视查询是这样的。

DECLARE db_cursor CURSOR FOR 
    SELECT *
    FROM
        (Select top 100 percent
             [students].stu_id as StuID, SysDate, Points, MajorSeq, Major_ID
         From 
             [dbo].[StudentRegsterations] 
         inner join 
             [dbo].[students] on [dbo].[StudentRegsterations].Stu_ID = [dbo].[students].stu_id) WorkOrders
PIVOT
(
  max(Major_ID)
  FOR [MajorSeq] IN (
    [1],[2],[3],[4],[5],[6],[7],[8],[9],[10],
    [11],[12],[13],[14],[15],[16],[17],[18],[19],[20]
  )
) AS PivotTable 
order by [Points] desc,[SysDate] desc

DECLARE @StuID [int];
DECLARE @Major_ID [int];
DECLARE @MajorSeq [int];
DECLARE @SysDate [date];
DECLARE @Points [decimal](10, 2);
DECLARE @1 [int];DECLARE @2 [int];DECLARE @3 [int];DECLARE @4 [int];DECLARE @5 [int];DECLARE @6 [int];DECLARE @7 [int];
DECLARE @8 [int];DECLARE @9 [int];DECLARE @10 [int];DECLARE @11 [int];DECLARE @12 [int];DECLARE @13 [int];DECLARE @14 [int];
DECLARE @15 [int];DECLARE @16 [int];DECLARE @17 [int];DECLARE @18 [int];DECLARE @19 [int];DECLARE @20 [int];

OPEN db_cursor;

FETCH NEXT FROM db_cursor INTO  @StuID, @Major_ID, @MajorSeq, @SysDate, @Points,
@1,@2,@3,@4,@5,@6,@7,@8,@9,@10,@11,@12,@13,@14,@15,@16,@17,@18,@19,@20;

WHILE @@FETCH_STATUS = 0
BEGIN
   --Do stuff with scalar values
   --InsertThisStudent()
   print CAST(@Points as varchar(10)) + '  -  ' + CAST(@SysDate as varchar(20))

   FETCH NEXT FROM db_cursor INTO  @StuID, @Major_ID, @MajorSeq, @SysDate, @Points, @1,@2,@3,@4,@5,@6,@7,@8,@9,@10,@11,@12,@13,@14,@15,@16,@17,@18,@19,@20;
END;

CLOSE db_cursor;
DEALLOCATE db_cursor;

简述所有我想要的，使用任何 SQL 服务器方式循环数据透视查询，使用任何小查询样本，未提交我的代码。

Answer 1

将数据透视查询的结果保存到临时 table（使用 INTO #TempTable）并循环 #TempTable。

编辑。但是，它也应该适用于您的代码。也许尝试 CLOSE db_cursor 并再次执行它。我认为您已经有了导致问题的 db_cursor 的一些定义。

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