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MySQL CREATE TABLE products ( product_id INT, product_name varchar(25), price DECIMAL(4, 2) You can have NULL values in any column in your table, except for primary key columns. Use the keywords This video provides a clear and practical explanation of
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The NOT NULL and UNIQUE Constraints | SQL
MySQL: NOT NULL constraint
NOT NULL & UNIQUE Constraints in SQL | Easy Examples with Real Life Based
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Last Updated: May 23, 2026
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