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In a MySQL schema, what is the meaning of “AUTO_INCREMENT=3”
In MySQL, AUTO_INCREMENT=3 tells that the inserted record will start from 3 not the default 1. Let us first create a sample table and set auto increment to 3:
mysql> create table Auto_incrementDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> )AUTO_INCREMENT=3; Query OK, 0 rows affected (0.52 sec)
Following is the query to insert some records in the table using insert command:
mysql> INSERT INTO Auto_incrementDemo(Name) values('John');
Query OK, 1 row affected (0.12 sec)
mysql> INSERT INTO Auto_incrementDemo(Name) values('Larry');
Query OK, 1 row affected (0.15 sec)
mysql> INSERT INTO Auto_incrementDemo(Name) values('Bob');
Query OK, 1 row affected (0.15 sec)Following is the query to display records from the table using select command:
mysql> select *from Auto_incrementDemo;
This will produce the following output
+----+-------+ | Id | Name | +----+-------+ | 3 | John | | 4 | Larry | | 5 | Bob | +----+-------+ 3 rows in set (0.00 sec)
Look at the above sample output, id begins from 3, not 1, since we set AUTO_INCREMENT TO 3.
Updated on: 30-Jul-2019
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