How can I set my auto-increment value to begin from 1 in MySQL?
You can truncate the table to set auto_increment value to start from 1 in MySQL. Let us first create a table −
mysql> create table DemoTable
(
StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY
);
Query OK, 0 rows affected (1.44 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.35 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.30 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.06 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+
| StudentId |
+-----------+
| 1 |
| 2 |
| 3 |
| 4 |
+-----------+
4 rows in set (0.00 sec)
Now, if you will insert more values, then the StudentId, which is AUTO_INCREMENT will continue from 5. To avoid this, first, truncate the table −
Following is the query to truncate the table to start auto_increment value from 1 −
mysql> truncate table DemoTable;
Query OK, 0 rows affected (0.93 sec)
mysql> select *from DemoTable;
Empty set (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.07 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output. Now, since we truncated the table above, therefore the AUTO_INCREMENT begins from 1 again as shown in the below output −
+-----------+
| StudentId |
+-----------+
| 1 |
| 2 |
| 3 |
+-----------+
3 rows in set (0.00 sec)
Published on 04-Oct-2019 11:28:15
