jeśli RDBMS obsługuje funkcję okna,
dla SQL Server 2012
SELECT Qty,
SUM(Qty) OVER (ORDER BY Qty) AS CumulativeTOTAL
FROM tableName
dla SQL Server 2008
SELECT a.Qty, (SELECT SUM(b.Qty)
FROM TableName b
WHERE b.Qty <= a.Qty)
FROM TableName a
ORDER BY a.Qty;