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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

Top Differences Read Today Agile vs Waterfall model

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The Agile and Waterfall both models are popular in Software development. The Agile model is so flexible compared to the waterfall model. The top differences between Waterfall and Agile give you a clear understanding of both processes. Waterfall Model The traditional model is a waterfall. It has less flexibility. Expensive and time-consuming model. Less scalable to meet the demand of customer requirements. The approach is top-down. Starting from requirements one has to finish all the stages, till deployment to complete one cycle. With a small change in requirement, one has to follow all the stages till deployment. The waterfall model creates idleness in resource management. Agile Model The agile model is excellent for the rapid deployment of small changes The small split requirements you can call sprints Less idleness in resource management. Scope for complete team involvement. Faster delivery makes clients happy. You can deploy changes related to compliance or re