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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

How Micro-services differ from SOA

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Here you will know the differences between microservices and SOA. Both are different architectures. 1. Micro-services  Microservices are interconnected using simple API You can develop highly scalable and modular applications Service-based architecture It is distributed architecture Here, security is a big challenge. Since there is no middleware Functional services, basically this kind No coordination between services. 2. SOA Service-based architecture It is distributed architecture Security is good It is an infrastructure kind of service Links and References Popular differences between Micro-Services and SOA models Architecture for microservices