Microsoft SQL Server
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Microsoft SQL Server OVER Clause Cumulative Sum
Example
Using the Item Sales Table, we will try to find out how the sales of our items are increasing through dates. To do so we will calculate the Cumulative Sum of total sales per Item order by the sale date.
SELECT item_id, sale_Date
SUM(quantity * price) OVER(PARTITION BY item_id ORDER BY sale_Date ROWS BETWEEN UNBOUNDED PRECEDING) AS SalesTotal
FROM SalesTable
