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SQL Interview Preparation—Intermediate Level

Question: Aggregate Window Function

Explore how to apply aggregate window functions in SQL to calculate total sales transactions by month. This lesson helps you understand window functions for real-world sales data analysis, enhancing your ability to write efficient queries for data summarization and preparing for intermediate SQL interviews.

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Question

We have a database for a company that manages information about its employees, the product categories they handle, the products within those categories, and the sales made. The Employees table stores unique identifiers (EID), employee names, and ages. The  ...