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Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900

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BuyFindarrow_forward

Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900
Chapter 5, Problem 14RQ
Textbook Problem
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What is a surrogate primary key, and when would you use one?

Program Plan Intro

Surrogate primary key:

  • A system assigned primary key in a relational database such as a serial number or any other which is not derived from any data in the database is known as surrogate primary key.
  • It is deputy of the primary key and will act as a primary key in the database and does not have any other significance.
  • To simplify the primary key structures in the database, surrogate primary keys are created, and this ensures unique identification process in a relation.

Explanation of Solution

Conditions to use the surrogate key:

The surrogate key for a relation is created when a primary key of a relation holds the below three conditions:

  • If the relation has a composite primary key, then surrogate key should be created.
    • If a primary key consists of more than attribute to uniquely identify a row or column in a relational database, it is known as composite primary key.
  • Presence of inefficient natural primary key...

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