How to use ALTER TABLE Statement with DROP INDEX Clause In MariaDB
In MariaDB, the ALTER TABLE statement is used to change an existing table’s structure. It lets you adjust restrictions, indexes, and more. It also lets you add, remove, or alter columns.
Syntax:
ALTER TABLE table_name DROP INDEX index_name;
Replace table_name with the name of the table where the index is declared and index_name with the name of the index you wish to drop.
Example:
ALTER TABLE example_table DROP INDEX age_index;
-- Showing the Indexes defined on example_table
SHOW INDEX FROM example_table;
Output:
Explanation: The above query remove the age_index Index defined on example_table.
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
.
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