Dropping the PRIMARY KEY Index
In MariaDB, A column, or group of columns, in a database that uniquely identifies every row in the table is called a primary key. The values in the designated columns are guaranteed to be unique and non-NULL by the primary key requirement. A primary key column, or group of columns, is also utilised to guarantee entity integrity and offer a rapid and effective means of searching through information.
Using the ALTER TABLE Statement to Remove a Primary Key
To drop a primary key index in MariaDB, we can use the ALTER TABLE statement with the DROP PRIMARY KEY clause.
Syntax:
ALTER TABLE table_name
DROP PRIMARY KEY;
Replace table_name with name of the table.
Before Dropping the Primary Key, Our table looks:
Before Remove the primary key
Now we will DROP Primary Key:
ALTER TABLE example_table
DROP PRIMARY KEY;
After Dropping the PRIMARY KEY:
AFTER Dropping the PRIMARY KEY
Explanation: Now the primary key has been removed.
Dropping an Index in MariaDB
In MariaDB, indexes play a crucial role in enhancing query performance by facilitating fast data access within a table. However, there are scenarios where you might need to drop indexes. This article explores various methods to drop indexes in MariaDB, including using DROP INDEX, ALTER TABLE DROP INDEX, and ALTER TABLE DROP KEY statements. Additionally, it covers dropping a primary key index using ALTER TABLE DROP PRIMARY KEY.