Question

我正在进行sql server查询，其中我有2个表

tblUsers(ID,Name)

tblPayments(ID,User_ID,Date,Amount)

我想获得每个用户提供的最后一笔付款。为此，我使用了以下查询 -

select distinct tblPayments.* from tblPayments inner join tblUsers on  
tblUsers.ID=tblPayments.User_ID

但上述查询返回用户提供的所有付款。但我想每个用户只需支付一笔款项，即用户上次付款。任何人都可以帮助我。

Answer 1

尝试此查询

select tblPayments.* from tblPayments 
inner join(select Userid,max(id) as id
 from tblPayments group by Userid) a on a.id=tblPayments.id

Answer 2

您可以尝试以下查询来获取每个用户的最后一笔付款

CREATE TABLE tblUsers (ID INT, NAME VARCHAR(20))
CREATE TABLE tblPayments(ID INT, User_Id INT, OrderDATE DATE, Payment Decimal)

INSERT INTO tblUsers VALUES (1,'User 1'),(2,'User 2')
INSERT INTO tblPayments VALUES (1,1,'2015-05-02',12.0),
(2,1,'2015-05-03',15.0),
(3,2,'2015-05-06',17.0),
(4,2,'2015-05-07',11.0)


SELECT tp1.*, tu.NAME
FROM tblPayments tp1
 JOIN (
SELECT User_ID,MAX(OrderDate) AS MaxDate
FROM tblPayments
GROUP BY User_Id) tp2
ON tp1.User_Id = tp2.User_Id
AND tp1.OrderDATE = tp2.MaxDate
JOIN tblUsers tu 
ON tu.ID = tp1.User_Id

Answer 3

为每个用户获取最新的付款日期（使用交叉申请来实现）然后使用该日期从tblPayments表中单独过滤这些记录。

   SELECT b.ID,
           b.Date,
           b.Amount
    FROM   tblusers a
           JOIN tblPayments b
             ON a.ID = b.User_ID
           CROSS apply (SELECT Max(Date) AS mx_date
                        FROM   tblPayments c
                        WHERE  a.ID = c.ID) cp
    WHERE  b.Date = cp.mx_Date

Answer 4

SQL Row_Number() function with Partition By clause可以帮助我们为每个用户订购付款记录

以下是使用SQL CTE expression

构建Select查询的方法

with CTE as (
select
    p.User_ID,
    u.Name,
    p.ID,
    p.Date,
    p.Amount,
    rn = ROW_NUMBER() OVER (Partition By User_ID Order By Date desc)
from tblUsers u
inner join tblPayments p on u.ID = p.User_ID
)
select * from CTE where rn = 1

查找用户最新单笔付款

4 个答案: