How to Sum multiple lines in sql

Question

I have multiple lines of data all sharing the same Company id.

Is there a way to \'sum\' all the amounts to give me one line of data per company id using SQL Server

Answer 1

WITH T ( Company_Name, Company_ID, Amount )
     AS
     (
      SELECT 'Company 6', '10024', 120 UNION ALL
      SELECT 'Company 6', '10024', 569 UNION ALL
      SELECT 'Company 6', '10024', 53 UNION ALL
      SELECT 'Company 6', '10024', 100 UNION ALL
      SELECT 'Company 6', '10024', 564 UNION ALL
      SELECT 'Company 7', '10638', 9500 UNION ALL
      SELECT 'Company 7', '10638', 105 UNION ALL
      SELECT 'Company 7', '10638', 624 
     )
SELECT DISTINCT Company_Name, Company_ID, 
       SUM(Amount) OVER (PARTITION BY Company_ID) AS total_amount
  FROM T;