Adding a Primary Key to a Table
To add a primary key in a table that’s already there, we use an ALTER TABLE statement. We get the choice to make a new column or use one that’s already there as the primary key. The query for doing this :
Syntax:
ALTER TABLE students
ADD PRIMARY KEY (student_id);
Output:
Explanation:
- This query changes the current student’s table. It adds a main identifier rule to the student_id section.
- The unique student_id helps keep data in check. This is essential for good organization and relations with other table.
- ALTER TABLE is used to adjust the table’s layout. ADD PRIMARY KEY pinpoints the main identifier rule.
MariaDB Primary Key
Primary keys are important in the field of relational databases. They keep the data unique and aid in easy data fetching. This article is about understanding the primary keys in MariaDB. MariaDB is a widely used open-source system for managing relational databases.
The MariaDB database is used for various purposes such as data warehousing, e-commerce, enterprise-level features, and logging applications. MariaDB will efficiently enable you to meet all your workload. It works in any cloud database and works at any scale either small or large.
In this article, We will learn about the PRIMARY Key in MariaDB along with examples and perform various operations and queries and so on.