8. PRIMARY KEY IN SQL
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8. PRIMARY KEY IN SQL
SQL Primary Key Explained: What, Why, and How! In this video, explore the PRIMARY KEY constraint in SQL and learn how it helps ensure data integrity! 🔐 What is a Primary Key? A PRIMARY KEY is a column (or a set of columns) that uniquely identifies each row in a table. No two rows can have the same primary key value, and it can’t be NULL ...
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