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SQL Query: 3 Methods for Calculating Cumulative SUM

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SQL provides various constructs for calculating cumulative sums, offering flexibility and efficiency in data analysis. In this article, we explore three distinct SQL queries that facilitate the computation of cumulative sums. Each query leverages different SQL constructs to achieve the desired outcome, catering to diverse analytical needs and preferences. Using Window Functions (e.g., PostgreSQL, SQL Server, Oracle) SELECT id, value, SUM(value) OVER (ORDER BY id) AS cumulative_sum  FROM your_table; This query uses the SUM() window function with the OVER clause to calculate the cumulative sum of the value column ordered by the id column. Using Subqueries (e.g., MySQL, SQLite): SELECT t1.id, t1.value, SUM(t2.value) AS cumulative_sum FROM your_table t1 JOIN your_table t2 ON t1.id >= t2.id GROUP BY t1.id, t1.value ORDER BY t1.id; This query uses a self-join to calculate the cumulative sum. It joins the table with itself, matching rows where the id in the first table is greater than or

5 Top Features People Need Today in Modern Devices

Smart devices in the current world play a key role. It is because these have better features to help people. In this post, I shared the top features people expect in smart devices.

Now the world is mature enough to design devices and connect them with some intelligence and should give some benefit to users.

Intelligence in the Modern Devices.

Devices installed with Software, you can call Intelligent things. Modern devices nowadays have intelligence. 


People look at Smart things is the problem-solving approach. At the same time, smart things should generate revenue.

Modern devices features

List of Smart Devices.


There are many smart devices already in the market. For example, smartphones, smart appliances, Shoes, watches, and more. 


The real requirement is increasing user experience in those devices.


Design companies are advising their departments to implement high user experience in their devices. 


For example smart cameras, advice on personal and financial matters.

Features People Need in Modern Devices.


The market expectations for smart things are as follows
  • Unique Design
  • High user experience
  • Real-time problem solver
  • Unique solutions

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