创建员工信息表t_user

CREATE TABLE t_user(

  id INT PRIMARY KEY AUTO_INCREMENT,

  username VARCHAR(20) ,

  password VARCHAR(20) ,

  age int ,

  phone VARCHAR(20) ,

  email VARCHAR(20) ,

  is_Delete int

)DEFAULT CHARSET=UTF8;

往员工表中插入数据:

INSERT
INTO t_user
VALUES(null,'张三','123456',23,'110','11111@qq.com',1),(null,'历史','123456',23,'110','11111@qq.com',1),(null,'孙悟空','123456',23,'110','11111@qq.com',2),(null,'李白','123456',23,'110','11111@qq.com',2),(null,'八戒','123456',23,'110','11111@qq.com',2);

问题:发现用delete from t_user where id=6;这个语句删除不了,其它字段名也试过了也不行,如下:

mysql> select * from t_user;
+----------+----------------+----------------+-----------+-------------+--------------+-----------------+
|   id |   username |   password |   age |   phone |   email |   is_Delete |
+----------+----------------+----------------+-----------+-------------+--------------+-----------------+
| 1 | 唐僧 | 123456 | 23 | 110 | 11111@qq.com | 2 |
| 2 | 张三 | 123456 | 23 | 110 | 11111@qq.com | 1 |
| 3 | 历史 | 123456 | 23 | 110 | 11111@qq.com | 1 |
| 4 | 孙悟空 | 123456 | 23 | 110 | 11111@qq.com | 2 |
| 5 | 李白 | 123456 | 23 | 110 | 11111@qq.com | 2 |
| 6 | 八戒 | 123456 | 23 | 110 | 11111@qq.com | 2 |
+----------+----------------+----------------+-----------+-------------+--------------+-----------------+
6 rows in set (0.00 sec) mysql> mysql> delete from t_user where id=6;
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 'delete from t_user where id=6' at line 1
mysql> delete from t_user where id='';
ERROR 1054 (42S22): Unknown column 'id' in 'where clause'
mysql> delete form t_user where id=6;
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 't_user where id=6' at line 1
mysql> delete from t_user where id=6;
ERROR 1054 (42S22): Unknown column 'id' in 'where clause'
mysql> delete from t_user where username='八戒';
ERROR 1054 (42S22): Unknown column 'username' in 'where clause'
mysql> delete from t_user where t_user.id=6;
ERROR 1054 (42S22): Unknown column 't_user.id' in 'where clause'
mysql>

然后发现是表中的字段名有空格,正常的没空格的如下:

mysql> select * from dept;
+----+--------+
| id | name |
+----+--------+
| 1 | 神仙 |
| 2 | 妖怪 |
+----+--------+

字段名出现空格的话,通过字段名进行数据操作的时候要给字段名添加单引号,如下:

mysql> delete from t_user where 'id'=6;
Query OK, 0 rows affected, 1 warning (0.07 sec)

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