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How to get primary key of a table in MySQL?
To get the primary key of a table, you can use the show command. The syntax is as follows −
SHOW INDEX FROM yourDatebaseName.yourTableName WHERE Key_name = 'PRIMARY';
Suppose, we have a table with two primary keys; one of them is “Id” and second is “RollNum". The query for a table is as follows −
mysql> create table TwoOrMorePrimary −> ( −> Id int, −> Name varchar(200), −> RollNum int −> , −> Primary key(Id,Age) −> ); Query OK, 0 rows affected (0.85 sec)
Apply the above syntax to get primary key of a table. The query is as follows −
mysql> SHOW INDEX FROM business.TwoOrMorePrimary −> WHERE Key_name = 'PRIMARY';
The following is the output −
+------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression | +------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ | twoormoreprimary | 0 | PRIMARY | 1 | Id | A | 0 | NULL | NULL | | BTREE | | | YES | NULL | | twoormoreprimary | 0 | PRIMARY | 2 | RollNum | A | 0 | NULL | NULL | | BTREE | | | YES | NULL | +------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ 2 rows in set (0.12 sec)
Updated on: 30-Jul-2019
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