Mysql Adding values in a column based on values in other column

Question

What is the mysql query to get the below result from the table?. Addition in the amount column should be carried out based on the invoiceID.

Answer 1

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

Answer 2

try this:

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 demo

Answer 3

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