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How can I view the indexes I have set up in MySQL?
To view the indexes, you can use SHOW command.
Following is the syntax −
show index from yourTableName;
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20), LastName varchar(20) ); Query OK, 0 rows affected (0.46 sec)
Following is the query to create an index −
mysql> create index id_FirstName on DemoTable(Id,FirstName); Query OK, 0 rows affected (0.52 sec) Records : 0 Duplicates : 0 Warnings : 0
Following is the query to view the indexes I have set up in MySQL −
mysql> show index from DemoTable;
This will produce the following output displaying the index as well −
+--------------+------------+--------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | +--------------+------------+--------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+ | DemoTable | 0 | PRIMARY | 1 | Id | A | 0 | NULL | NULL | | BTREE | | | YES | | DemoTable | 1 | id_FirstName | 1 | Id | A | 0 | NULL | NULL | | BTREE | | | YES | | DemoTable | 1 | id_FirstName | 2 | FirstName | A | 0 | NULL | NULL | YES | BTREE | | | YES | +--------------+------------+--------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+ 3 rows in set (0.26 sec)
Updated on: 30-Jul-2019
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