NULL in SQL: The Biggest Interview Trap I SQL Interview Question I

NULL in SQL is one of the most confusing and misunderstood concepts, and it is a top reason why candidates fail SQL interviews. In this video, we explain NULL in SQL from the absolute basics to advanced interview scenarios, using real queries and in-depth logic. 📌 What you’ll learn in this video: ✔️ What NULL actually means in SQL ✔️ NULL vs 0 vs empty string ✔️ Why NULL = NULL returns NULL ✔️ Correct use of IS NULL and IS NOT NULL ✔️ NULL in WHERE clause (common traps) ✔️ NULL in calculations and COALESCE ✔️ COUNT, SUM, AVG with NULL ✔️ Interview tricks and edge cases -- Query to create table: CREATE TABLE employees ( emp_id INT, name VARCHAR(50), salary INT, bonus INT, manager_id INT ); --Insert Data INSERT INTO employees VALUES (1, 'Amit', 50000, 5000, NULL), (2, 'Neha', 60000, NULL, 1), (3, 'Raj', NULL, 3000, 1), (4, 'Pooja', 45000, NULL, 2); This video is perfect for: ✔️ SQL beginners ✔️ Data Analysts ✔️ Data Engineers ✔️ Interview preparation ✔️ Anyone struggling with SQL logic 👉 Watch till the end to avoid interview-killing SQL mistakes. 📢 Comment below: Which NULL concept confused you the most? 👍 Like | 🔔 Subscribe for more SQL interview content. SQL Interview QnAs: https://www.youtube.com/playlist?list=PLL871c9yfLoimvglCSz6UQoqLJcFBJGKo ***Join our Telegram Group for regular updates on Jobs and Data Science materials: https://t.me/skilltechathon Follow us on Instagram: https://www.instagram.com/skilltechathon/ #sql #postgresql #deloitte #deloittejobs #mysql #interview #dataengineering #dataanalysis #capgemini #deloitte #deloittejobs #capgeminihiring #SQLInterview #SQLNULL #LearnSQL #DataAnalytics #DataScience #PostgreSQL #pgAdmin