How can we use SQL to calculate the monthly cumulative sum?

2 years ago
Isabella Edwards
1 minute

In SQL, window functions can be used to achieve cumulative sums by month. Specifically, the SUM function can be combined with the OVER clause to accomplish this. Below is an example SQL query for calculating the cumulative total of sales for each month.

SELECT 
    month,
    sales,
    SUM(sales) OVER (ORDER BY month) AS cumulative_sales
FROM 
    sales_data

In this query, sales_data is a table containing sales data, with columns month and sales. The window function SUM(sales) OVER (ORDER BY month) will calculate the cumulative sum of sales, sorted by month. The final result will show the sales amount for each month along with the total cumulative sales amount up to that month.

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