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SQL Interview Preparation—Intermediate Level

Question: Nested Subquery with HAVING and Aggregate Functions

Explore how to craft SQL queries combining nested subqueries, HAVING clauses, and aggregate functions. This lesson helps you identify months with the highest total sales for each product category, enhancing your data analysis and query optimization skills.

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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 ProductCategories table contains ...