6. NOT NULL & UNIQUE CONSTRAINTS | sql tutorial
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6. NOT NULL & UNIQUE CONSTRAINTS | sql tutorial
SQL Constraints: NOT NULL & UNIQUE Explained In this video, learn how NOT NULL and UNIQUE constraints work in SQL! 🚀 NOT NULL: Ensures a column cannot store NULL (empty) values. This guarantees every row has a value in that column. UNIQUE: Ensures all values in a column are different. Perfect for fields like email or usernames. Want more ...
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