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How to reset the primary key of a table in mysql?
The reset the primary key of a table means to reset the auto_increment property to 1. The syntax is as follows to reset the primary key of a table.
alter table yourTableName auto_increment = 1;
To understand, let us create a table −
mysql> create table ResetPrimaryKey −> ( −> Id int auto_increment, −> PRIMARY KEY(Id) −> ); Query OK, 0 rows affected (0.59 sec)
Insert some records into the table. The query to insert records is as follows −
mysql> insert into ResetPrimaryKey values(); Query OK, 1 row affected (0.18 sec) mysql> insert into ResetPrimaryKey values(); Query OK, 1 row affected (0.15 sec) mysql> insert into ResetPrimaryKey values(); Query OK, 1 row affected (0.09 sec) mysql> insert into ResetPrimaryKey values(); Query OK, 1 row affected (0.09 sec)
Now you can display all records with the help of select statement. The query is as follows −
mysql> select *from ResetPrimaryKey;
The following is the output that displays only the ID, which is a Primary Key:
+----+ | Id | +----+ | 1 | | 2 | | 3 | | 4 | +----+ 4 rows in set (0.00 sec)
Here is the query to reset the primary key of a table using alter −
mysql> alter table ResetPrimaryKey auto_increment = 1; Query OK, 0 rows affected (0.21 sec) Records: 0 Duplicates: 0 Warnings: 0
The query to check that we have added auto_increment property successfully or not:
mysql> desc ResetPrimaryKey;
The following is the output −
+-------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+----------------+ | Id | int(11) | NO | PRI | NULL | auto_increment | +-------+---------+------+-----+---------+----------------+ 1 row in set (0.11 sec)
Updated on: 29-Jun-2020
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