SQL Server 2016 : Turn multiple lines into columns with the different iterations

Question

我有一个表，其中有许多用于唯一 MemberID 的 InsuranceNo。如果有多个 InsuranceNo，我希望 InsuranceNo 转移到一列，因此最后每个 MemberID 占一行，该 ID 的 InsuranceNo 的所有迭代都作为一列。

MemberID       InsuranceNo
--------------------------
123456            dser
124571            jklh
123456            abcd

我希望它看起来像这样:

MemberID       InsuranceNo1             InsuranceNo2
-----------------------------------------------------
123456            dser                  abcd
124571            jklh

谢谢!

Answer 1

还有另一种选择...只需将“YourTable”更改为您的实际表名称。

示例

Declare @SQL varchar(max) = '
Select *
 From (
        Select MemberID
              ,Item     = concat(''InsuranceNo'',row_number() over (Partition By MemberID Order By (Select NULL)))
              ,Value    = InsuranceNo
         From YourTable
      ) A
 Pivot (max([Value]) For [Item] in (' + Stuff((Select ','+QuoteName(concat('InsuranceNo',ColNr)) 
                                               From (Select Distinct ColNr=row_number() over (Partition By MemberID Order By (Select NULL)) from YourTable ) A  
                                               For XML Path('')),1,1,'')  + ') ) p'
--Print @SQL
Exec(@SQL);

返回

MemberID    InsuranceNo1    InsuranceNo2
123456      dser            abcd
124571      jklh            NULL

如果它有助于您理解 PIVOT，生成的 SQL 如下所示:

Select *
 From (
        Select MemberID
              ,Item     = concat('InsuranceNo',row_number() over (Partition By MemberID Order By (Select NULL)))
              ,Value    = InsuranceNo
         From YourTable
      ) A
 Pivot (max([Value]) For [Item] in ([InsuranceNo1],[InsuranceNo2]) ) p