当我在 AUTO_INCREMENT MySQL 列中插入值"NULL"时会发生什么?
mysqlmysqli database
当我们将 NULL 值插入 AUTO_INCREMENT 列时，MySQL 将返回序列号。
示例
mysql> Create table employee(id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, Name Varchar(10)); Query OK, 0 rows affected (0.16 sec) mysql> Insert into employee(id, Name) values(NULL, 'Gaurav'); Query OK, 1 row affected (0.07 sec) mysql> Select * from employee; +----+---------+ | id | Name | +----+---------+ | 1 | Gaurav | +----+---------+ 1 row in set (0.00 sec)
