Answered: Why it is important to have a primary…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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SQL Database Design

Why it is important to have a primary key column within a database table?

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Step 1:Definition

The primary key inside a database table is the minimum set of columns which uniquely identifies every row within the table.
A primary key column can't have NULL values. A table will have the most effective one number one key, which may consist of a single or more than one field. Following is the few importance of getting primary key inside the table:-

The database operations such as looking for facts are quicker because an index is used, based on the number one key.
using the number one key, you may effortlessly pick out and locate specific rows in the database desk.
They let you replace/delete the best unique records with the aid of uniquely identifying them.
The desk’s facts are taken care of based totally on the primary key.
They assist you to keep away from placing reproduction records on a desk.
They permit creating referential integrity constraints (i.e. use of overseas keys).

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