PIVOT 或 UNPIVOT：两者都行吗？

Question

我四处寻找与我所拥有的特别相似的例子，但我找不到任何东西。据我所知，我不确定是否可行，但我想我会先在这里问一下。

1.原文Table

我有一个 table 看起来像这样：

+-------------+------+----------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| Application | Year | YearTarg | JanTarg | FebTarg | MarTarg | AprTarg | MayTarg | JunTarg | JulTarg | AugTarg | SepTarg | OctTarg | NovTarg | DecTarg |
+-------------+------+----------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| Mod         | 2018 |  5700000 |  400000 |  300000 |  400000 |  600000 |  500000 |  500000 |  600000 |  500000 |  500000 |  600000 |  500000 |  400000 |
| RC          | 2018 |  1700000 |   40000 |   50000 |   60000 |   80000 |  100000 |  120000 |  150000 |  180000 |  220000 |  250000 |  220000 |  230000 |
| Flow        | 2018 |  2000000 |   30000 |   50000 |   20000 |   80000 |  250000 |   80000 |   70000 |  200000 |  300000 |  350000 |  200000 |  190000 |
| Non-RA      | 2018 | 13400000 | 1100000 |  900000 | 1000000 | 1200000 | 1000000 | 1100000 | 1100000 | 1000000 | 1100000 | 1500000 | 1100000 | 1300000 |
| AMH         | 2018 |  3500000 |  100000 |  100000 |  300000 |  200000 |  500000 |  400000 |  300000 |  500000 |  200000 |  200000 |  400000 |  300000 |
+-------------+------+----------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+

2。新建 Table

我希望返回的结果如下所示：

我真的很纠结，我认为部分原因是包含数字 1 代表 1 月的数字，2 代表 2 月的数字，依此类推。

我需要此功能才能根据月份值重新加入另一个 table，即 NewTable.Month = OtherTable.InvMonth (which is just MONTH(GETDATE()))。

这可以做到吗？

Answer 1

Unpivot 会工作，但我认为 CROSS APPLY 更容易并且提供更多的灵活性。

例子

Select A.Application
      ,A.Year
      ,B.*
 From  YourTable A
 Cross Apply ( values (1,JanTarg)
                     ,(2,FebTarg)
                     ,(3,MarTarg)
                     ,(4,AprTarg)
                     ,(5,MayTarg)
                     ,(6,JunTarg)
                     ,(7,JulTarg)
                     ,(8,AugTarg)
                     ,(9,SepTarg)
                     ,(10,OctTarg)
                     ,(11,NovTarg)
                     ,(12,DecTarg)
             ) B ([Month],[Target])

Answer 2

如果您更喜欢使用UNPIVOT：

declare @tmp table([Application] varchar(50), [Year] int, [YearTarg] int, [JanTarg] int, [FebTarg] int, [MarTarg] int, [AprTarg] int, [MayTarg] int, [JunTarg] int, [JulTarg] int, [AugTarg] int, [SepTarg] int, [OctTarg] int, [NovTarg] int, [DecTarg] int)

insert into @tmp values
('Mod'   , 2018, 5700000, 400000, 300000, 400000, 600000, 500000, 500000, 600000, 500000, 500000, 600000, 500000, 400000),
('RC'    , 2018, 1700000,  40000,  50000,  60000,  80000, 100000, 120000, 150000, 180000, 220000, 250000, 220000, 230000),
('Flow'  , 2018, 2000000,  30000,  50000,  20000,  80000, 250000,  80000,  70000, 200000, 300000, 350000, 200000, 190000),
('Non-RA', 2018,13400000,1100000, 900000,1000000,1200000,1000000,1100000,1100000,1000000,1100000,1500000,1100000,1300000),
('AMH'   , 2018, 3500000, 100000, 100000, 300000, 200000, 500000, 400000, 300000, 500000, 200000, 200000, 400000, 300000)

select u.[Application], 
       u.[Year],
       case when u.[Month] ='JanTarg' then 1 when u.[Month] ='FebTarg' then 2 when u.[Month] ='MarTarg' then 3 when u.[Month] ='AprTarg' then 4 when u.[Month] ='MayTarg' then 5 when u.[Month] ='JunTarg' then 6 when u.[Month] ='JulTarg' then 7 when u.[Month] ='AugTarg' then 8 when u.[Month] ='SepTarg' then 9 when u.[Month] ='OctTarg' then 10 when u.[Month] ='NovTarg' then 11 when u.[Month] ='DecTarg' then 12 end as [Month],
       u.[Target]
from @tmp s 
unpivot 
( 
    [Target] 
    for [Month] in ([JanTarg],[FebTarg],[MarTarg],[AprTarg],[MayTarg],[JunTarg],[JulTarg],[AugTarg],[SepTarg],[OctTarg],[NovTarg],[DecTarg]) 
) u;

结果：

PIVOT 或 UNPIVOT：两者都行吗？

PIVOT or UNPIVOT: Will either work?

sql

sql-server

pivot

ssms

unpivot