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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 Digital Skills You need in Future

Before you perform work in a new-age digital job, focus on the real skills you need to learn.


real digital skills

1. Automate Repeated Tasks

  • Take the best example of saving all the emails from google account. That is after sending an email that should save in an Excel document.
  • This is one kind of Skill. So learning technologies to create Tools for this kind of automation provide you a lot of job opportunities.

2. Automate Stop Function

For example, work and home both are different. After certain hours the access to the Company network should be stopped. So that you can focus on your Home duties. Here you should have tools to do this kind of activity.

3. Data visualization

How to present data in a user-friendly way is the topmost digital skill. Nowadays there are many tools present. The Best example is Tableau. You can present the data in a user-friendly way.

4. Working Ability in Cloud Environment

For example, the olden days' servers are complex to migrate and move from one area to another. Cloud computing helps you to ease your job. You can move anywhere easily across the globe. Cloud servers really helpful. Learning Cloud computing shows a better career.

5. Ability to Use Modern Communication Channels

You can use Smart Phones, Social media, WhatsUp, Video conference, Voice calls, Internet-connected phones, to communicate with remote clients. You need to know how to use all these channels.


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