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Autoincrement in MySQL begins from 1? How can we begin it from another number?
The autoincrement in MySQL gives a unique number every time. By default, it starts at 1. If you want to start from another number, then you need to change the auto-increment value with the help of ALTER command or you can give value at the time of table creation.
Let us first create a table −
mysql> create table DemoTable ( UniqueNumber int NOT NULL AUTO_INCREMENT, PRIMARY KEY(UniqueNumber) ); Query OK, 0 rows affected (0.53 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.08 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------------+ | UniqueNumber | +--------------+ | 1 | | 2 | | 3 | | 4 | +--------------+ 4 rows in set (0.00 sec)
Following is the query to change the auto_increment value to begin from another number −
mysql> alter table DemoTable AUTO_INCREMENT=1000; Query OK, 0 rows affected (0.18 sec) Records: 0 Duplicates: 0 Warnings: 0
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 (0.19 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output. Now the new auto_increment value inserted and begins from 1000 −
+--------------+ | UniqueNumber | +--------------+ | 1 | | 2 | | 3 | | 4 | | 1000 | | 1001 | | 1002 | +--------------+ 7 rows in set (0.00 sec)
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