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Keys in SQL
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SQL Keys

In MySQL, keys are fundamental for maintaining data integrity and establishing relationships between tables. SQL keys play vital roles, contributing to an optimized database structure and enhanced performance. Let's explore these keys in detail.

Candidate Key

A candidate key in a relational database is a set of one or more columns that can uniquely identify a record in a table. It could potentially be used as a primary key.

There can be more than one candidate key but only one primary key.

In the employee table, the columns id and email can uniquely identify a record

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Table of Contents

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