ORACLE将数据透视表移到行 [英] ORACLE unpivot columns to rows

问题描述

ORACLE 10 我在这里读了几篇文章，但没有想到一个简单的解决方案

ORACLE 10 Hi, I was reading several posts here and i did not come up to a simple solution

我有以下数据:

Transacion_ID  GROSS_AMOUNT  DISCOUNT_AMOUNT 
1,             10 ,          -1 
2,             1002 ,        -14 
3,             36 ,          -5 

而且我需要毫无疑问地得到

And I need to unpivot to get

Transacion_ID  TYPE     AMOUNT 
1,             GROSS ,  10 
1,             DISC  ,  -1 
2,             GROSS ,  1002 
2,             DISC  ,  -14 
3,             GROSS ,  36 
3,             DISC  ,  -5 

我的第一种方法是将其拆分为两个查询，然后拆分为UNION ALL两种结果，但是此操作每5小时运行一次，并且有多个联接，因此拆分意味着执行时间几乎重复.我在oracle 10中寻找诸如pivot/unpivot之类的东西.

My first approach was to split this in two queries and then just UNION ALL boths results, but this run every 5 hours and has several joins, so spliting means nearly duplicate exec time. I was looking for something like pivot/unpivot in oracle 10.

推荐答案

尝试一下

Select * From (
Select 
Transacion_ID,
Case When C.lvl = 1 Then 'GROSS'
     When C.lvl = 2 Then 'DISC'
End TYPE,
Case When C.lvl = 1 Then GROSS_AMOUNT
     When C.lvl = 2 Then DISCOUNT_AMOUNT
End AMOUNT
From T
cross join (select level lvl from dual connect by level<=2) c     
) where amount is not null
order by 1

SQL DEMO

此查询基于此处

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