Question

I’m using SQL Server 2008.

This is my data:

column1   columnAmount
-----------------------
  ab           3
  ac           2
  ab           4

So in my query I want to sum the values which are the same in the colum1.

My desired output would be:

column1    columnAmount
----------------------    
  ab           7
  ac           2

How can I do this?

Answer 1

This is a basic SUM ... GROUP BY

SELECT column1,
       Sum(columnAmount) AS columnAmount
FROM   YourTable
GROUP  BY column1 

As the syntax suggests it divides the input into groups (one for each distinct value of column1) and calculates the sum for each group.