Скачать или смотреть 📌 What is CHECK Constraint in SQL? Learn Fast!

Learn how to use the SQL CHECK constraint to enforce data validation rules directly at the table level! This quick tutorial explains how to add a CHECK clause in your CREATE TABLE or ALTER TABLE statements—perfect for beginners and job interviews. ✅📊

✅ Syntax + Real Example
✅ Prevent invalid data entry
✅ Easy to understand – in under 60 seconds!

Level up your SQL skills instantly!
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