开始之前,让我们尝试在使用 CREATE TABLE 语句时将“when”设置为列名 –
mysql> create table DemoTable693( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), When datetime );
这将产生以下输出。将出现错误:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'When datetime at line 5
您需要使用反引号将保留字括起来,例如“when”。让我们首先创建一个表并实现相同的:
mysql> create table DemoTable693 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), `When` datetime ); Query OK, 0 rows affected (0.63 sec)
使用插入命令在表中插入一些记录:
mysql> insert into DemoTable693(StudentName,`When`) values('Chris',NOW()); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable693(StudentName,`When`) values('Robert',CURDATE()); Query OK, 1 row affected (0.22 sec)
使用 select 语句显示表中的所有记录 –
mysql> select *from DemoTable693;
这将产生以下输出 –
+-----------+-------------+---------------------+ | StudentId | StudentName | When | +-----------+-------------+---------------------+ | 1 | Chris | 2019-07-21 18:57:19 | | 2 | Robert | 2019-07-21 00:00:00 | +-----------+-------------+---------------------+ 2 rows in set (0.00 sec)原文来自:www.php.cn
© 版权声明
文章版权归作者所有,未经允许请勿转载。
THE END
暂无评论内容