mysql - Mysql根据其他列中的值在列中添加值

Question

从表中获取以下结果的 mysql 查询是什么？金额栏的加法应根据invoiceID进行。

Answer 1

SELECT @rownum := @rownum + 1 AS ID, InvoiceID, SUM(AMOUNT) 
FROM <tablename>, (SELECT @rownum := 0) r
GROUP BY InvoiceID

Answer 2

尝试这个：

select  @i:=@i+1 AS id,a.*
     from
     (select InvoiceID,sum(Amount) as Amount
      from your_table
      group by InvoiceID)a,(SELECT @i:=0) r 

SQL Fiddel 演示

Answer 3

select ID,InvoiceID, SUM(Amount)
from <table>
group by InvoiceID