Windows Function - How to Calculate Running Total

Windows Function - How to Calculate Running Total

 
Query used:
 
-- Create a view that sums sales per city per year
 
 
 
 
 
CREATE VIEW CitySalesByYear
 
 
 
 
 
 
AS
 
 
SELECT c.City, YEAR(h.OrderDate) OrderYear, SUM(d.OrderQuantity) OrderQuantity
FROM SalesOrderHeader h
JOIN SalesOrderDetail d ON d.SalesOrderNumber = h.SalesOrderNumber
JOIN Customers c ON h.CustomerKey = c.CustomerKey
GROUP BY c.City, YEAR(h.OrderDate)
 
 
 
GO
 
 
 
 
 
-- View the data in the view
 
 
SELECT * FROM CitySalesByYear
ORDER BY City, OrderYear
 
 
 
GO
 
 
 
 
 
-- Use OVER to show a running total by year
 
 
SELECT City, OrderYear, OrderQuantity,
SUM(OrderQuantity) OVER (PARTITION BY City ORDER BY OrderYear
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningQty
FROM CitySalesByYear

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