10 SQL Interview Guide: Best-Selling Product in Each Month Using SQL.

Want to find the best-selling product for each month? This is a common SQL interview question that tests your ability to work with aggregations, date functions, and ranking techniques in SQL. Whether you're preparing for a Data Analyst, Data Engineer, or Business Intelligence role, this concept is a must-know!

In this video, we will explore how to write a SQL query to find the top-selling product for each month based on sales data. This is particularly useful in sales analytics, business insights, and marketing strategies.

💡 What Will You Learn?
✅ How to use GROUP BY to aggregate sales by product and month
✅ How to use SUM() to calculate total sales per product
✅ How to use PARTITION BY and RANK() to identify the highest-selling product
✅ A step-by-step breakdown of the query
✅ How this query is useful in real-world business scenarios

Why Is This Query Important?
Real-World Application: Businesses use this to track trends, optimize inventory, and plan promotions.
Interview Relevance: Tests your understanding of ranking functions and aggregation in SQL.
Decision Making: Helps companies understand seasonal trends and which products are most profitable.

Example Use Case:
Imagine you run an e-commerce business, and you want to know which product sells the most in each month. Using this SQL query, you can identify top-performing products, adjust marketing campaigns, and optimize stock levels.

For example, if Product A sells the most in December, you can offer discounts in November to boost early purchases! 📈

📌 Make sure to watch the full video to master this SQL query and impress in your next interview!

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Видео 10 SQL Interview Guide: Best-Selling Product in Each Month Using SQL. канала The Data Mentor