🚨 SQL Fact Most Beginners Learn Too Late!

Many people think NOT IN and NOT EXISTS always return the same result... but they don't.

📌 NOT IN

- Works well when there are no NULL values.
- Can return unexpected results if the subquery contains NULL.

📌 NOT EXISTS

- Safely handles NULL values.
- Often preferred for correlated subqueries.
- Commonly used in real-world SQL queries.

💡 When NULL values are involved, NOT EXISTS is usually the safer choice.

🎯 A favorite SQL interview concept for testing query logic!

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