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SQL Interview Preparation—Intermediate Level

Question: Subquery with HAVING and Aggregate Functions

Explore how to construct SQL queries that leverage subqueries, HAVING clauses, and aggregate functions. This lesson helps you analyze employee sales data by comparing individual average sales to category averages, enabling effective performance assessment.

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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 unique identifiers ( ...