我们如何将AUTO_INCREMENT应用于列？
AUTO_INCREMENT表示该列将自动获取值。为了说明这一点，我们创建了一个表“employees”，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，我们可以看到为列ID提供了auto-increment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');
mysql> Insert Into employees(Name) Values('Shyam');
mysql> Insert Into employees(Name) Values('Mohan');
mysql> Insert Into employees(Name) Values('Sohan');
mysql> Select * from employees;
+----+-------+
| Id | Name |
+----+-------+
| 1 | Ram |
| 2 | Shyam |
| 3 | Mohan |
| 4 | Sohan |
+----+-------+
4 rows in set (0.00 sec)