SQL 服务器数据透视 + 求和 + 分组依据

Question

我有如下数据，我需要对总和枢轴进行分组

AA	BB	date
a	1	01/01/2020
a	2	01/01/2020
b	5	01/01/2020
b	1	01/01/2020
c	5	01/01/2020
d	1	01/01/2020
d	8	02/01/2020
e	1	01/01/2020

我用 sql 代码获得了什么

	a	b	c	d	e
01/01/2020	3	6	5	1	1
02/01/2020	/	/	/	8	/

我需要得到什么：a和d分组为f和c，e分组为g和b分开

	b	f	g
01/01/2020	6	4	6
02/01/2020	/	8	/

我得到了以下 sql 但我似乎无法进行分组求和。你是在旋转之前还是之后做？

SELECT * FROM(
SELECT AA,Date
FROM [dbo].[Data] )
AS SourceTable 
PIVOT(SUM([BB]) 
FOR [AA] IN([a],[b],[c],[d],[e])) 
AS PivotTable

如果我尝试这个它不起作用

SELECT * FROM(
SELECT AA,Date
FROM [dbo].[Data] )
AS SourceTable 
PIVOT(SUM([BB]) 
FOR [AA] IN([a]+[d],[b],[c]+[e])) 
AS PivotTable

Answer 1

我发现使用条件聚合更简单：

select 
    date,
    sum(case when d.aa = 'b'         then bb else 0 end) as b,
    sum(case when d.aa in ('a', 'd') then bb else 0 end) as f,
    sum(case when d.aa in ('c', 'e') then bb else 0 end) as g
from data d
group by date

Answer 2

按如下方式使用条件聚合：

select sum(case when aa in ('a','d') then BB  end) as f,
       sum(case when aa in ('c','e') then BB  end) as g,
       sum(case when aa = 'b' then BB  end) as b
  from table_name
group by date

SQL 服务器数据透视 + 求和 + 分组依据

SQL server pivot + sum + group by

sql

sql-server

pivot

sum

aggregate-functions