Relational Database Design and Modeling for Software Engineers
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Keys in Relational Databases
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In relational databases, keys play a crucial role in uniquely identifying records within a table, establishing relationships between tables, and maintaining data integrity. Keys ensure that each record in a database can be accurately retrieved, updated, or deleted without ambiguity. This lesson covers the different types of keys used in relational databases.

Types of Keys

Primary Key

A primary key is a unique identifier for each record in a table. It ensures that each row in a table is distinct, meaning no duplicate values are allowed in the primary key column(s)

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