Question: In a relational database, what does the primary key field enable users to do ? In a relational database, what does the primary key field

In a relational database, what does the primary key field enable users to do?
In a relational database, what does the primary key field enable users to do?
Store information about table structures
Implement data constraints
Define the format of screens and forms
Combine data from different tables
Differentiate one record from another

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