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Passing NULL to MySQL for auto increment?
Yes, we can pass NULL as in the below syntax −
insert into yourTableName values(NULL,yourValue1,yourValue2,...N);
Let us first create a table −
mysql> create table DemoTable1503 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(20), -> ClientAge int -> ); Query OK, 0 rows affected (0.45 sec)
Insert some records in the table using insert command. Since we have set NOT NULL above, it won’t affect auto_increment −
mysql> insert into DemoTable1503 values(NULL,'Chris',25); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1503 values(NULL,'David',28); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable1503 values(NULL,'Bob',45); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1503 values(NULL,'Mike',57); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1503;
This will produce the following output. Auto Increment got printed in the same way (not null) −
+----------+------------+-----------+ | ClientId | ClientName | ClientAge | +----------+------------+-----------+ | 1 | Chris | 25 | | 2 | David | 28 | | 3 | Bob | 45 | | 4 | Mike | 57 | +----------+------------+-----------+ 4 rows in set (0.00 sec)
Updated on: 11-Dec-2019
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