数据透视 table 期间的重复列

Question

我有一个table喜欢

select * 来自 myTable

ID  Type    Prop1    Prop2    Prop3    Prop4    Prop5
--  ------  -------  -------  -------  -------  -------
1   Hot     10       9        23       32       4
1   Cold    2        24       53       34       5
2   Hot     11       9        23       32       4
2   Cold    22       1        53       30       11

我想像那样转动我的 table

select * 来自 myPivotTable

ID  HotProp1 HotProp2 HotProp3 HotProp4 HotProp5 ColdProp1 ColdProp2 ColdProp3 ColdProp4 ColdProp5 
--  -------  -------  -------  -------  -------- --------- --------- --------- --------- ---------
1   10       9        23       32       4        2          24       53         34       5
2   11       9        23       32       4        22         1        53         30       11

如何使用 oracle sql 中的 pivot 函数将 myTable 转换为 myPivotTable？

Answer 1

如果您的 Oracle 版本 11g 及更高版本，您可以简单地 "re-pivot" 它（您已经旋转了数据）- 先取消旋转然后再次旋转：

with t1(id1, type1, Prop1, Prop2, Prop3, Prop4, Prop5) as(
  select 1,   'Hot' ,  10 ,  9 , 23,32 , 4 from dual union all
  select 1,   'Cold',  2  ,  24, 53,34 , 5  from dual union all
  select 2,   'Hot' ,  11 ,  9 , 23,32 , 4  from dual union all
  select 2,   'Cold',  22 ,  1 , 53,30 , 11 from dual 
  )
 select *
   from( select *
           from t1
        unpivot (
          val for col in (prop1, prop2, prop3, prop4, prop5)
        )
   )
   pivot(
     max(val) for (col, type1) in (('PROP1', 'Hot') as HotProp1, 
                                   ('PROP2', 'Hot') as HotProp2, 
                                   ('PROP3', 'Hot') as HotProp3,
                                   ('PROP4', 'Hot') as HotProp4,
                                   ('PROP5', 'Hot') as HotProp5,
                                   ('PROP1', 'Cold') as ColdProp1,
                                   ('PROP2', 'Cold') as ColdProp2,
                                   ('PROP3', 'Cold') as ColdProp3,
                                   ('PROP4', 'Cold') as ColdProp4,
                                   ('PROP5', 'Cold') as ColdProp5)
   )

结果：

      ID1   HOTPROP1   HOTPROP2   HOTPROP3   HOTPROP4   HOTPROP5  COLDPROP1  COLDPROP2  COLDPROP3  COLDPROP4  COLDPROP5
---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
         1         10          9         23         32          4          2         24         53         34          5
         2         11          9         23         32          4         22          1         53         30         11

Here is the demo

Answer 2

我认为条件聚合是一个比复杂数据透视表简单得多的查询：

select id,
       sum(case when type = 'Hot' then Prop1 end) as Hot_Prop1,
       sum(case when type = 'Hot' then Prop2 end) as Hot_Prop2,
       sum(case when type = 'Hot' then Prop3 end) as Hot_Prop3,
       sum(case when type = 'Hot' then Prop4 end) as Hot_Prop4,
       sum(case when type = 'Hot' then Prop5 end) as Hot_Prop5,
       sum(case when type = 'Cold' then Prop1 end) as Cold_Prop1,
       sum(case when type = 'Cold' then Prop2 end) as Cold_Prop2,
       sum(case when type = 'Cold' then Prop3 end) as Cold_Prop3,
       sum(case when type = 'Cold' then Prop4 end) as Cold_Prop4,
       sum(case when type = 'Cold' then Prop5 end) as Cold_Prop5
from myPivotTable
group by id;

数据透视 table 期间的重复列

duplicate column during pivot table

sql

oracle

pivot