Question

嗨，我有一张“发票”表

customer_number | Invoice_Number | Name | Address | Total_Amount

选择我正在使group by为客户编号并合计发票的Total_amount。我仍然想在输出中显示他的名字和地址。转储发票编号。

但是我的住址和客户名称都是我的更改，我想根据特定客户的最后发票编号创建最新的address和name列。

我该怎么做？我是usind ms sql

Answer 1

类似这样的东西：

SELECT customer_number
      ,Name
      ,Address
      ,Total_Amount
FROM
(
    SELECT customer_number
          ,Name
          ,Address
          ,SUM(Total_Amount) OVER (PARTITION BY customer_number) AS Total_Amount
          ,DENSE_RANK() OVER (PARTITION BY customer_number ORDER BY Invoice_Number DESC) AS row_id
    FROM [my_table] 
) DS
WHERE row_id = 1;

使用OVER子句，我们可以计算每一行的总和。就像分组一样，但是group by却使用PARTITION BY，每组一行，而是返回所有行。

同时，我们使用排名功能按invoce_number desc从最新到第一的顺序排列每个客户的行。

最后，我们只需要获取所需的行即可。

Answer 2

有许多方法可以根据您的SQL Server版本进行此操作。以下方法适用于任何版本，但如果您有数百万行，则可能会很慢。如果您使用的是较早版本，则还有更多不错的方法。

select customer_number, TotamAmount = sum(Total_Amount)
, Name = (select top 1 Name from myTable where customer_number = t1.customer_number order by Invoice_Number desc)
, Address = (select top 1 Address from myTable where customer_number = t1.customer_number order by Invoice_Number desc)
from myTable t1
group by customer_number

Answer 3

您可以尝试查询

SELECT customer_number, 
       sumamount, 
       [name], 
       [address] 
FROM   (SELECT customer_number, 
               Sum (total_amount) 
                 OVER ( 
                   partition BY customer_number ) sumAmount, 
               [name], 
               [address], 
               Row_number() 
                 OVER( 
                   partition BY customer_number 
                   ORDER BY [primarykey] )          AS [CustomerInvoiceId] 
        FROM   [tablename])X 
WHERE  [customerinvoiceid] = 1

Answer 4

创建表#temp （

customer_number int

，发票编号为int

，名称为varchar（50）

，地址varchar（50）

，总计金额int

）

插入#temp值（1,1，'sam'，'india'，100）

插入#temp值（1,2，'sam k'，'USA'，200）

插入#temp值（2,3，“桑迪”，“非洲”，100）

插入#temp值（2,4，'sandy sharma'，'india'，200）

选择t1。客户编号，t1。发票编号，名称，地址，总和（总计）

来自#temp t1

内部加入

（

从#temp中选择max（Invoice_Number）作为Invoice_Number，客户编号

按客户编号分组

）t2在t1.Invoice_Number = t2.Invoice_Number

和t1.customer_number = t2.customer_number

按t1.customer_number，t1.Invoice_Number，名称，地址分组

使用分组依据时如何选择最后一个值

4 个答案: