表名:余额
cname amount type
--------------------------------------
Jhon 150 A
Jhon 200 B
Jhon 100 A
Jhon 30 A
Jhon 55 B
======================================
我想要一个SQLquery给我这个结果:
cname totalOf_A totalOf_B
---------------------------------------
Jhon 280 255
=========================================
我已经尝试了以下内容:
select ,cname,sum(amount),type from balances group by cname,type
结果:
cname amount type
---- ----- ----
Jhon 250 A
Jhon 255 B
所以,我希望结果在一行和一个查询中 请提出任何建议 提前致谢。
答案 0 :(得分:1)
您要做的是称为条件聚合。你可以使用
select
cname,
sum(case when type='A' then amount else 0 end) as total_A,
sum(case when type='B' then amount else 0 end) as total_B
from balances
group by cname
答案 1 :(得分:0)
听起来你想要使用PIVOT。文档中有一些例子。
https://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx
答案 2 :(得分:0)
select A.cname,A.typeof_A,B.typeof_B
FROM
(
select cname,sum(amount) as typeof_A
from balances
where type = 'A'
group by cname
) as A
INNER JOIN
(
select cname,sum(amount) as typeof_B
from balances
where type = 'B'
group by cname
) as B
ON B.cname = A.cname