Question

我有两张桌子：

Customer，其中Id列代表客户ID。
CustomerDonation包含CustomerId（FK），Amount和DatePayed

我希望让所有客户与他们最近的捐赠和捐赠金额一起。

我在查询中收到重复值，因此我不会在此处粘贴。

Answer 1

您也可以使用WITH TIES选项

 Select Top 1 With Ties *
  From  YourTable
  Order By Row_Number() over (Partition By CustomerId Order By DatePayed Desc)

Answer 2

WITH
   SortedDonation AS
(
    SELECT
        ROW_NUMBER() OVER (PARTITION BY CustomerId ORDER BY DatePayed DESC)  AS SeqID,
        *
    FROM
       CustomerDonation
)
SELECT
    *
FROM
    Customer
LEFT JOIN
    SortedDonation
        ON  SortedDonation.CustomerId = Customer.Id
        AND SortedDonation.SeqId      = 1

如果同一个客户可以使用相同的DatePayed进行多次捐赠，那么这将随意挑选其中一个。

如果您向ORDER BY添加其他字段，则可以确定地选择所需的字段。

或者，如果您希望所有人都使用DENSE_RANK()而不是ROW_NUMBER()

Answer 3

使用Row_Number（）分析函数。

Select * from (
   Select customerId,Amount,DatePayed, row_number() over (partition by CustomerId order by DatePayed desc) as rowN) 
   as tab where rowN = 1

Answer 4

您只需要CustomerDonation表格。如果您需要客户的其他信息，可以加入Customer表。

WITH cte AS (
SELECT
    CustomerId
    , MAX(DatePayed) AS LastDate
FROM
    CustomerDonation
)
SELECT
    cd.CustomerId
    , cd.Amount
    , cd.DatePayed
FROM
    CustomerDonation cd
    JOIN cte ON cd.CustomerId = cte.CustomerId
        AND cd.DatePayed = cte.LastDate

最新客户捐款和金额

4 个答案: