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How to auto increment with 1 after deleting data from a MySQL table?
For this, you can use TRUNCATE TABLE command. Let us first create a table −
mysql> create table DemoTable1796 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1796(StudentName) values('Chris Brown');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1796(StudentName) values('David Miller');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement
mysql> select * from DemoTable1796;
This will produce the following output
+-----------+--------------+ | StudentId | StudentName | +-----------+--------------+ | 1 | Chris Brown | | 2 | David Miller | | 3 | John Doe | +-----------+--------------+ 3 rows in set (0.00 sec)
Here is the query to delete records from the table −
mysql> delete from DemoTable1796; Query OK, 3 rows affected (0.00 sec)
Now insert a record into the table
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 4 | John Doe |
+-----------+-------------+
1 row in set (0.00 sec)Now you can use TRUNCATE TABLE command
mysql> truncate table DemoTable1796; Query OK, 0 rows affected (0.00 sec)
Now, let us insert some records into the table
mysql> insert into DemoTable1796(StudentName) values('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> select * from DemoTable1796;
+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 1 | John Doe |
+-----------+-------------+
1 row in set (0.00 sec)
Updated on: 25-Feb-2020
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