用Sum选择Column

Question

我有下表：

我有这个问题：

Select StartDate, SubscriptionGUID,
(Select sum(TotalExistingDBHoursInPeriod) 
from dbo.SQLDBBusinessKPIDB_Snap  
where [Platform] = 'SAWA') as "SAWA Contrib"
FROM dbo.SQLDBBusinessKPIDB_Snap 

返回以下结果：

我想要的是＆＃34; SAWA Contrib＆＃34;要仅为SubscriptionGUID行的总和，它当前返回[Platform] = "SAWA"

所有行的总和

任何指针都会很棒！

Answer 1

向内部查询添加约束，如：

Select so.StartDate, so.SubscriptionGUID,
(Select sum(TotalExistingDBHoursInPeriod) 
from dbo.SQLDBBusinessKPIDB_Snap si
where si.[Platform] = 'SAWA' and si.SubscriptionGUID = so.SubscriptionGUID) as "SAWA Contrib"
FROM dbo.SQLDBBusinessKPIDB_Snap so