从列到行的数据转换

Question

我有一个记录DCP_SC_DOT_TBL，其中有2个键SETID和CONTRACTID。除此之外，还有78个列是复选框，其中包含值Y或Blank。例如：

SETID CONTRACTID 1 2 3 ...... 78 
DCPID 00102  Y  Y 
DCPID 00192   Y Y   Y 

现在我想删除所有这些列，并创建一个新的行对于每个非空列创建一个表，例如，像这样：

SETID CONTRACTID Checkbox(New column for all the 78 columns) 
DCPID 00102  1 
DCPID 00102  3 
DCPID 00192  2 
DCPID 00192  3 
DCPID 00192  78 

可有人请建议如何实现这一目标？我只想要包含针对CONTRACTID的某些数据的列。

Answer 1

在重新阅读您的文章，这听起来像你只需要一个大的联合查询：

Select SetId, ContractId, '1' As ColNum, 
From SomeTable As S1 
Where S1.Col1 = 'Y' 
Union All 
Select SetId, ContractId, '2' 
From SomeTable As S1 
Where S1.Col2 = 'Y' 
Union All 
Select SetId, ContractId, '3' 
From SomeTable As S1 
Where S1.Col3 = 'Y' 
... 
Union All 
Select SetId, ContractId, '78' 
From SomeTable As S1 
Where S1.Col78 = 'Y' 

如果你想导致主表等信息，那么你会加入这个结果集它：

Select 
From SomeTable As S 
     Join (
       Select SetId, ContractId, '1' As ColNum, 
       From SomeTable As S1 
       Where S1.Col1 = 'Y' 
       Union All 
       Select SetId, ContractId, '2' 
       From SomeTable As S1 
       Where S1.Col2 = 'Y' 
       Union All 
       Select SetId, ContractId, '3' 
       From SomeTable As S1 
       Where S1.Col3 = 'Y' 
       ... 
       Union All 
       Select SetId, ContractId, '78' 
       From SomeTable As S1 
       Where S1.Col78 = 'Y' 
       ) As Z 
      On Z.SetId = S.SetId 
       And Z.ContractId = S.ContractId