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SQL Interview Preparation—Intermediate Level

Question: Using LAG() and LEAD()

Explore how to apply SQL window functions LAG() and LEAD() to compare monthly sales figures for an Electronics category. Understand how to generate dynamic columns showing previous and next month sales amounts, helping you analyze sales trends effectively and write complex queries using analytic functions.

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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 (CategoryID) for each category and assigns one ...