SQL 将列值映射到其他列

Question

我有一个旋转查询，它输出的内容如下：

[ID][Value][DateField1][Val1][Val2][Val3]
 1   R2     2014-01-01  0.3   3.2   3.1
 1   R1     2014-01-02  NULL  2.2   0.5
 1   R2     2014-01-02  0.7   NULL  NULL

我需要进一步修改它，使值列变成：

[ID][DateField1][Val1][Val2][Val3][Val1R][Val2R][Val3R]
 1   2014-01-01  0.3   3.2   3.1   R2     R2     R2
 1   2014-01-02  0.7   2.2   0.5   R2     R1     R1

这不会是一个支点，但我不完全确定如何去做。如果有人能指出我正确的方向，我将不胜感激。谢谢！

Answer 1

也许您的查询太复杂了，所以我不确定您可以使用 with，但我在下面的查询中进行了测试，这里 the DEMO 给出了您想要的：

create table query ([ID] int,
[Value] varchar(2),[DateField1] date,
[Val1] decimal(10,2),[Val2] decimal(10,2),
[Val3] decimal(10,2))

insert into query 
values(1,'R2','2014-01-01',0.3,3.2,3.1),
      (1,'R1','2014-01-02',null,2.2,0.5),
      (1,'R2','2014-01-02',0.7,null,null)

with cte
as
(
select * from query -- your query
)      
select distinct q.ID,q.DateField1,
   isnull(q.val1 ,(select top 1 qq.val1 from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val1 is not null)) val1,
   isnull(q.val2,(select top 1 qq.val2 from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val2 is not null)) val2,
   isnull(q.val3,(select top 1 qq.val3 from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val3 is not null))val3,
    case 
    when q.val1 is null then (select top 1 qq.value from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val1 is not null)
    else q.value end as val1R,
    case 
    when q.val2 is null then (select top 1 qq.value from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val2 is not null)
    else q.value end as val2R,
    case 
    when q.val3 is null then (select top 1 qq.value from cte qq 
                        where qq.ID=q.ID and qq.datefield1=q.datefield1
                        and qq.val3 is not null)
    else q.value end as val3R

 from cte q

Answer 2

with D as (
    yourquery
)
select
    ID, DateField1,
    sum(Val1) as Val1,
    sum(Val2) as Val2,
    sum(Val3) as Val3,
    min(case when Val1 is not null then Value end) as Val1R,
    min(case when Val2 is not null then Value end) as Val2R,
    min(case when Val3 is not null then Value end) as Val3R,
from D
group by ID, DateField1

SQL 将列值映射到其他列

SQL Map column values to other columns

sql

sql-server-2012