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:
Now we will DROP Primary Key:
ALTER TABLE example_table
DROP 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
.