我们如何将AUTO_INCREMENT应用到一列上？

AUTO_INCREMENT意味着该列将自动获取值。为了说明这一点，我们创建了一个名为“employees”的表，如下所示：

mysql> Show Create Table employees\G

*************************** 1. row ***************************
Table: employees

Create Table: CREATE TABLE `employees` (
   `Id` int(11) NOT NULL AUTO_INCREMENT,
   `Name` varchar(35) DEFAULT NULL,
   PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

1 row in set (0.00 sec)

从上面的结果集中，我们可以看到id列被赋予了自动递增选项。现在，当我们在Name字段中插入值时，id字段将自动获取值−

mysql> Insert Into employees(Name) Values('Ram');
Query OK, 1 row affected (0.09 sec)

mysql> Insert Into employees(Name) Values('Shyam');
Query OK, 1 row affected (0.03 sec)

mysql> Insert Into employees(Name) Values('Mohan');
Query OK, 1 row affected (0.04 sec)

mysql> Insert Into employees(Name) Values('Sohan');
Query OK, 1 row affected (0.04 sec)

mysql> Select * from employees;

+----+-------+
| Id | Name  |
+----+-------+
| 1  | Ram   |
| 2  | Shyam |
| 3  | Mohan |
| 4  | Sohan |
+----+-------+

4 rows in set (0.00 sec)

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