🔹 Real-World Data Science Example Suppose you are analyzing sales data. You want to identify the highest-value transactions. SELECT customer_id, product_id, quantity, price, quantity * price AS transaction_value FROM sales ORDER BY transaction_value DESC; This can help with: • Finding high-value transactions • Identifying important customers • Investigating unusually large purchases • Preparing data for further analysis 🔹 Common Mistakes Mistake 1 — Forgetting DESC If you want the highest salary first: ORDER BY salary DESC; Not ORDER BY salary; Mistake 2 — Wrong column Make sure t

🚀 Data Science Roadmap 2026 📍 Phase 3: SQL for Data Science 📖 Topic 3 — ORDER BY ORDER BY is used to sort the rows returned by a SQL query. It helps you arrange data in a meaningful order, such as: • Highest salary to lowest salary • Lowest price to highest price • Newest date to oldest date • A–Z or Z–A • Highest sales to lowest sales 🔹 Basic Syntax SELECT column1, column2 FROM table_name ORDER BY column_name; By default, SQL sorts in ascending order. SELECT * FROM employees ORDER BY salary; This generally returns employees from the lowest salary to the highest salary. 🔹 ASC — A

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