如何在MySQL中已创建的表中插入AUTO_INCREMENT
使用ALTER命令。让我们先创建一个表-
mysql> create table DemoTable -> ( -> StudentName varchar(100) -> ); Query OK, 0 rows affected (0.46 sec)
以下是插入AUTO_INCREMENT−的查询
alter table DemoTable ADD COLUMN StudentId int NOT NULL; alter table DemoTable ADD PRIMARY KEY(StudentId); alter table DemoTable CHANGE StudentId StudentId int NOT NULL AUTO_INCREMENT;
使用INSERT命令−在表中插入一些记录
mysql> insert into DemoTable(StudentName) values('Chris');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(StudentName) values('David');
Query OK, 1 row affected (0.15 sec)使用SELECT语句显示表中的所有记录
mysql> select *from DemoTable;
输出结果
+-------------+-----------+ | StudentName | StudentId | +-------------+-----------+ | Chris | 1 | | David | 2 | +-------------+-----------+ 2 rows in set (0.00 sec)