如何在聚合函数SQL Server中使用where子句

Question

好的,我有一个看起来像这样的表:

ID   AMOUNT      PAID
1    50.00       Y
2    100.00      N
3    200.00      Y

我希望看到类似的东西:

Total     Due Paid
350.00    1   2

所以我的SQL看起来像(在我脑海里......它不会那样工作,这就是为什么我在这里)

select sum(amount)
,count(paid where paid='y') as due
,count(paid where paid='n') as paid 
from sometable where something=somethingelse

Answer 1

select sum(amount) as total, 
       sum(case paid when 'N' then 1 else 0 end) as due, 
       sum(case paid when 'Y' then 1 else 0 end) as paid
from sometable where something=somethingelse