ADVANCED SQL 🔥 Delete Duplicate Emails | 3 SQL Approaches Explained скачать в хорошем качестве

ADVANCED SQL 🔥 Delete Duplicate Emails | 3 SQL Approaches Explained

In this video, you’ll learn how to solve the classic SQL interview problem: 👉 Delete Duplicate Emails while keeping only one record Duplicate data is a very common issue in real-world databases, and knowing how to remove duplicates efficiently is an important SQL skill. In this tutorial, we will solve the problem using 3 different SQL approaches. Topics covered in this video: ✅ Understanding the duplicate email problem ✅ Why duplicates happen in real-world databases ✅ Approach 1: MIN() + NOT IN ✅ Approach 2: EXISTS with Self Join ✅ Approach 3: ROW_NUMBER() with CTE ✅ Step-by-step query explanation ✅ Interview tips and best practices By the end of this video: • You’ll understand SQL deduplication techniques • You’ll know multiple ways to remove duplicate rows • Your SQL interview preparation will improve • Your SQL problem-solving skills will become stronger 🎯 Perfect for: SQL beginners Data Analysts Data Engineers SQL interview preparation Database developers 👉 Practice the queries yourself 👉 Compare the approaches 👉 Share with your SQL learning community Visit www.bigdatayatra.com All views are my own. SQL Script CREATE TABLE Customers ( customer_id INT , name VARCHAR(50), email VARCHAR(100) ); INSERT INTO Customers (customer_id, name, email) VALUES (1, 'Ella', 'emily@example.com'), (2, 'David', 'michael@example.com'), (3, 'Zachary', 'sarah@example.com'), (4, 'Alice', 'john@example.com'), (5, 'Finn', 'john@example.com'), (6, 'Violet', 'alice@example.com'), (Null, 'Sam', Null);