Data Science & Machine Learning

SELECT p.product_name, SUM(o.quantity * o.price) AS revenue FROM orders o INNER JOIN products p ON o.product_id = p.product_id GROUP BY p.product_name ORDER BY revenue DESC; This combines: Orders ↓ Products ↓ GROUP BY ↓ Revenue calculation ↓ ORDER BY ↓ Highest…

If an order has no matching customer, the customer columns can contain NULL. Simple rule: RIGHT JOIN → Everything from right + matching data from left In practice, many analysts prefer rewriting a RIGHT JOIN as a LEFT JOIN by switching the table order because…

🚀 Data Science Roadmap 2026 📍 Phase 3: SQL for Data Science 📖 Topic 9 — SQL JOINS In real-world data analysis, information is often stored across multiple tables. For example: customers customer_id customer_name 101 Alice 102 Bob 103 Carol orders order_id cust…

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Regression is used to understand relationships between variables and/or predict numerical outcomes. Example: Predicting sales based on: • Advertising • Price • Season • Previous sales 22. Machine Learning Machine Learning allows computers to learn patterns fro…

Possible approaches: • Remove records • Mean/median imputation • Mode imputation • Model-based imputation The right method depends on the situation. 8. Exploratory Data Analysis — EDA EDA is the process of exploring data before building models. You investigate…

🚀 Data Science: Important Concepts You Should Know Data Science combines statistics, programming, data analysis, machine learning, and business understanding to extract useful insights and make better decisions from data. 1. What is Data Science? Data Science…

🗺️ 6 stops to a data career. Generative AI → Spreadsheets → SQL → AI assistants & agents → Python → Machine Learning. Then a capstone on your own dataset. Join Foundations of Data Science and AIML by iHUB Anubhuti IIITD Foundation. ✅ 4 Months | Online | 6-8 hr…