SQL Pivot 多列而不强制聚合

Question

我需要转出一些非规范化数据，但它会重复，所以我需要它转出列，然后返回多行。

我有一张这样的桌子

INSERT #TheTable
VALUES 
        ('StockCode'    ,'a'),
        ('Warehouse'    ,'b'),
        ('TrnYear'  ,'c'),
        ('TrnMonth' ,'d'),
        ('EntryDate'    ,'e'),
        ('TrnTime'  ,'f'),
        ('StockCode'    ,'1'),
        ('Warehouse'    ,'2'),
        ('TrnYear'  ,'3'),
        ('TrnMonth' ,'4'),
        ('EntryDate'    ,'5'),
        ('TrnTime'  ,'6')

但是当我旋转时它只返回一行：

SELECT  StockCode,
        Warehouse,
        TrnYear,
        TrnMonth,
        TrnTime,
        EntryDate        
FROM    #TheTable AS src 
PIVOT   (MAX(column_value)
         FOR COLUMN_NAME in ([TrnYear], [TrnMonth], [EntryDate], [TrnTime], [StockCode], [Warehouse])) AS piv 

结果：

StockCode   Warehouse   TrnYear TrnMonth    TrnTime EntryDate   
-------------------------------------------------------------   
a           b           c       d           f       e           

但我需要它回来

StockCode   Warehouse   TrnYear TrnMonth    TrnTime EntryDate   
-------------------------------------------------------------   
a           b           c       d           f       e           
1           2           3       4           5       6           

Answer 1

您可以先使用窗口函数，然后使用条件聚合：

select 
    max(case when column_name = 'StockCode' then column_value end) StockCode,
    max(case when column_name = 'Warehouse' then column_value end) Warehouse,
    max(case when column_name = 'TrnYear'   then column_value end) TrnYear,
    max(case when column_name = 'TrnMonth'  then column_value end) TrnMonth,
    max(case when column_name = 'TrnTime'   then column_value end) TrnTime,
    max(case when column_name = 'EntryDate' then column_value end) EntryDate
from (
    select t.*,
        row_number() over(partition by column_name order by column_value) rn
    from #TheTable t
) t
group by rn

Answer 2

您可以使用ROW_NUMBER()分析函数：

SELECT *
  FROM
 (
  SELECT column_name, column_value,
         ROW_NUMBER() OVER (PARTITION BY column_name ORDER BY column_value) AS rn
    FROM #TheTable 
 ) q
PIVOT   
 ( MAX(column_value)
   FOR column_name in ([TrnYear], [TrnMonth], [EntryDate], [TrnTime], [StockCode], [Warehouse])
 ) AS piv

或更动态地，使用：

DECLARE @cols  AS NVARCHAR(MAX),  @query AS NVARCHAR(MAX)

SET @cols = ( SELECT STRING_AGG(column_name,',') 
                FROM (SELECT DISTINCT column_name 
                        FROM [#TheTable] ) q );

SET  @query = 
 N'SELECT *  
     FROM
     (
      SELECT column_name, column_value,
             ROW_NUMBER() OVER 
            (PARTITION BY [column_name] ORDER BY [column_value]) AS rn
        FROM [#TheTable]
      ) f
    PIVOT 
    (
     MAX([column_value]) FOR [column_name] IN (' + @cols + N')
    ) AS piv '

EXEC sp_executesql @query;

演示

Answer 3

问题是每组列名我都需要一个 row_number 。 所以下面的工作

SELECT DISTINCT TrnYear,
                TrnMonth,
                EntryDate,
                TrnTime,
                StockCode,
                Warehouse
FROM
  (SELECT  (ROW_NUMBER() OVER (ORDER BY dw_view_change_event_nr) - 1) / 6 + 1 AS rn,
          COLUMN_NAME ,
         column_value
   FROM
     #TheTable AS tmp) AS src PIVOT (MAX(column_value)
                                                          FOR COLUMN_NAME in ([TrnYear], [TrnMonth], [EntryDate], [TrnTime], [StockCode], [Warehouse])) AS piv