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April 11, 2026 · 1 min read

Can you explain the purpose of a primary key in a SQL database and how it is different from a foreign key?

A primary key is a unique identifier for a record in a table, ensuring that no two records can have the same value in that column. A foreign key, on…

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📅 Apr 11, 2026 ⏱ 1 min read

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Can you explain the purpose of a primary key in a SQL database and how it is different from a foreign key?

COVER // CAN YOU EXPLAIN THE PURPOSE OF A PRIMARY KEY IN A SQL DATABASE AND HOW IT IS DIFFERENT FROM A FOREIGN KEY?

A primary key is a unique identifier for a record in a table, ensuring that no two records can have the same value in that column. A foreign key, on the other hand, is a reference to a primary key in another table, establishing a relationship between the two tables.

databases foreign key primary key sql

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