如何在SQL中创建动态数据透视查询

Question

我正在尝试在SQL中创建动态数据透视查询，但是我的问题是合同ID和tier desc列都是动态的，我不知道如何解决此问题。我有这样的东西：

这是我想看到的输出

Answer 1

此 可以通过重复列名来完成，但是，我无法想象为什么会想要这样。

@Col是我们应用别名os.system(MachUp.out)

的地方

示例

...[#] as [Tier Value]...

返回

Declare @Col varchar(max) = Stuff((Select Distinct ',' + concat(QuoteName(row_number() over (Partition By ContractID Order by TierDesc)),' as [Tier Value]') From Yourtable  Order by 1 For XML Path('')),1,1,'') 
Declare @SQL varchar(max) = Stuff((Select Distinct ',' + QuoteName(row_number() over (Partition By ContractID Order by TierDesc)) From Yourtable  Order by 1 For XML Path('')),1,1,'') 

Select  @SQL = '
Select ContractID,'+@Col+'
 From (  
        Select ContractID
              ,TierDesc
              ,ColNr = row_number() over (Partition By ContractID Order by TierDesc) 
         From  YourTable
      ) Src
 Pivot (max(TierDesc) for ColNr in ('+@SQL+') ) pvt
 '
 Exec(@SQL)

  

编辑-然后生成的SQL看起来像这样

ContractID  Tier Value  Tier Value  Tier Value
123         tier1       tier2       NULL
555         tier4       tier5       tier6
652         tier0       tier4       NULL

  

编辑2

Select ContractID
      ,[1] as [Tier Value]
      ,[2] as [Tier Value]
      ,[3] as [Tier Value]
 From (  
        Select ContractID
              ,TierDesc
              ,ColNr = row_number() over (Partition By ContractID Order by TierDesc) 
         From  YourTable
      ) Src
 Pivot (max(TierDesc) for ColNr in ([1],[2],[3]) ) pvt