M Mr. Dubey 🎓 Coach ⭐ 104.48K Points 📊 MySQL Q. Which of the following is a valid constraint in MySQL? (A) NONEMPTY (B) REQUIRED (C) NOT NULL (D) EMPTY 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (C) NOT NULL Explanation: `NOT NULL` ensures that a column cannot have a NULL value.