转动多列

Question

您好我有一个SQL查询，其结果如下表

ID   NAME   problem_ID   date_of_entry    elem_id   staff_id    
1    abc     456          12/12/2014      789          32
1    abc     768          12/01/2014      896          67
1    abc     897          02/14/2014      875          98
2    bcd     723          02/17/2014      287          09
2    bcd     923          09/13/2014      879          01
2    bcd     878          08/23/2014      hgd          34

我想要结果如下

 
ID   NAME   problem_ID_1   problem_ID_2 problem_ID_3 date_of_entry_1    date_of_entry_2  date_of_entry_3   elem_id_1  elem_id_2 elem_id_3   staff_id_1 staff_id_2  staff_id_3

problem_id，date_of条目，elem_id，staff_id都是动态的。你能告诉我如何使用枢轴功能或任何其他方式做到这一点。

Answer 1

试试这个 我已完成两个列problem_ID and date_of_entry您可以在pivot中添加另外两列。

这里有一个虚拟演示 http://sqlfiddle.com/#!3/ef8e8e/1

CREATE TABLE #Products
  (
     ID            INT,
     NAME          VARCHAR(30),
     problem_ID    INT,
     date_of_entry DATE,
     elem_id       VARCHAR(30),
     staff_id      INT
  );

INSERT INTO #Products
VALUES      (1,'abc',456,'2014/12/12',789,32),
            (1,'abc',768,'2014/12/01',896,67),
            (1,'abc',897,'2014/02/14',875,98),
            (2,'bcd',723,'2014/02/17',287,09),
            (2,'bcd',923,'2014/09/13',879,01),
            (2,'bcd',878,'2014/08/23','hgd',34)

DECLARE @problm         VARCHAR(MAX)='',
        @daofenty_id    VARCHAR(MAX)='',
        @aggproblm      VARCHAR(MAX)='',
        @aggdaofenty_id VARCHAR(MAX)='',
        @sql            NVARCHAR(max)

SET @problm = (SELECT DISTINCT Quotename('problm'+CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY problem_ID)))
                               + ','
               FROM   #Products
               FOR XML PATH(''))
SET @aggproblm = (SELECT DISTINCT ' max('
                                  + Quotename('problm'+CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY problem_ID)))
                                  + ') problm'
                                  + CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY problem_ID))
                                  + ','
                  FROM   #Products
                  FOR XML PATH(''))
SET @daofenty_id =(SELECT DISTINCT
                     + Quotename('daofenty_id'+CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY date_of_entry)))
                     + ','
                   FROM   #Products
                   FOR XML PATH(''))
SET @aggdaofenty_id = (SELECT DISTINCT + ' max('
                                        + Quotename('daofenty_id'+CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY date_of_entry)))
                                        + ') daofenty_id'
                                        + CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY date_of_entry))
                                        + ','
                       FROM   #Products
                       FOR XML PATH(''))

SET @problm = LEFT(@problm, Len(@problm) - 1)
SET @daofenty_id = LEFT(@daofenty_id, Len(@daofenty_id) - 1)
SET @aggproblm = LEFT(@aggproblm, Len(@aggproblm) - 1)
SET @aggdaofenty_id = LEFT(@aggdaofenty_id, Len(@aggdaofenty_id) - 1)
SET @sql = 'SELECT Id,name,' + @aggproblm + ','
           + @aggdaofenty_id + '
           FROM (select * from (SELECT ''problm''+convert(varchar(50),row_number() over(partition by ID order by problem_ID)) problm_id, ''daofenty_id''+convert(varchar(50),row_number() over(partition by ID order by date_of_entry)) daofenty_id ,
 ''elemid''+convert(varchar(50),row_number() over(partition by ID order by elem_id)) elemid ,   ''staffid''+convert(varchar(50),row_number() over(partition by ID order by staff_id)) staffid,*
      FROM #Products) A

      ) AS T

      PIVOT

     (max(problem_id) FOR problm_id IN

     (' + @problm + ')) AS P1

      PIVOT

      (max(date_of_entry) FOR daofenty_id IN

     ('
           + @daofenty_id + ')) AS P1
         group by id,name'

--PRINT @sql
EXEC Sp_executesql
  @sql 

限制号码。列

SET @problm = (SELECT DISTINCT TOP N Quotename('problm'+CONVERT(VARCHAR(50), Row_number() OVER(partition BY ID ORDER BY problem_ID)))
                                   + ','
                   FROM   #Products
                   FOR XML PATH(''))

同样地对其他列做同样的事情..