SQL tutorial for beginners | Part 3 | Primary key & foreign key
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SQL tutorial for beginners | Part 3 | Primary key & foreign key
In today's SQL tutorial we will learn more about the primary key and the foreign key which are both crucial parts of sql tables. A primary key is a special key which uniquely identifies each record in a table. It is very important in the relational database to have a unique identifier in each row of a table and primary key is just the thing you ...
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