CTE每個人

Question

我有一個表前三量與人均幾個匯款：

CREATE TABLE [dbo].[Transactions](
    [sender] [varchar](25) NULL, 
    [receiver] [varchar](25) NULL, 
    [TranDate] [date] NULL, 
    [amount] [money] NULL) 

我必須寫一個返回收到可以說1500美元的三筆交易帳戶列表查詢。如果有三筆（或更少）轉賬，則應列出賬戶名稱，總計1500美元。 我的查詢如下：

select d.receiver, d.Somme 
    from(
    select a.receiver,sum(a.amount) as Somme 
    from (SELECT top 3 receiver,[amount] 
    FROM [DEV_KPIGov].[dbo].[Transactions] 
    where receiver='Williams' 
    order by [amount] DESC) a 
    group by a.receiver 
    union all 
    select b.receiver,sum(b.amount) as Somme 
    from (SELECT top 3 receiver,[amount] 
    FROM [DEV_KPIGov].[dbo].[Transactions] 
    where receiver='Taylor' 
    order by [amount] DESC) b 
    group by b.receiver 
    union all 
    select c.receiver,sum(c.amount) as Somme 
    from (SELECT top 3 receiver,[amount] 
    FROM [DEV_KPIGov].[dbo].[Transactions] 
    where receiver='Jhonson' 
    order by [amount] DESC) c 
    group by c.receiver) d 
    where d.Somme>=1500 

有一個更加動態的方式來實現這一目標？我不喜歡我必須在「where」子句中列出每個接收者的名字的事實。我想知道是否可以通過CTE？我使用的是SQL Server 2012的感謝

Answer 1

這應該是可能的一個窗口集合函數：

select a.receiver, sum(a.amount) as amt 
from( 
select receiver,[amount], 
row_number() over(partition by receiver order by amount desc) as rownum 
from [DEV_KPIGov].[dbo].[Transactions] 
) as a 
where rownum <= 3 
group by a.receiver 
having amt >= 1500