Question

我从未想过这个含义，我创建了一个名为＆＃34的列;添加＆＃34;在mysql中。（显然，创建表时添加的是保留字并不是我的想法）虽然给出了每个查询，但结果却是一个问题。我已决定更改名称，现在我也无法更改名称。

我尝试了以下变化：无效

mysql> alter table ml_n1 m modify column m.add addmovie tinyint(4);                                 
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 'm modify column m.add addmovie tinyint(4)' at line 1

mysql> alter table ml_n1 modify column add addmovie tinyint(4);
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 'add addmovie tinyint(4)' at line 1

mysql> alter table ml_n1 modify column 'add' 'addmovie tinyint(4)';
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 ''add' 'addmovie tinyint(4)'' at line 1

mysql> alter table ml_n1 modify column 'add' addmovie tinyint(4);
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 ''add' addmovie tinyint(4)' at line 1

mysql> alter table ml_n1 change add addmovie tinyint(4);
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 'add addmovie tinyint(4)' at line 1

mysql> alter table ml_n1 change 'add' addmovie tinyint(4);
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 ''add' addmovie tinyint(4)' at line 1

有人会建议解决方法吗？

Answer 1

ALTER TABLE ml_n1 CHANGE COLUMN `add` addmovie TINYINT(4)

正如你暗示的那样;调用列add是有问题的，因为add是MySQL中的保留字，为了引用你需要用反引号转义它的列，`。

您需要CHANGE而不是MODIFY来更改列的名称。

N.B。来自docs：

当您使用CHANGE或MODIFY时，column_definition必须包含数据类型和应该应用于新列的所有属性，而不是索引属性，例如PRIMARY KEY或UNIQUE。

我不会称之为解决方法。

Answer 2

alter table ml_n1 change `add` addmovie tinyint(4);

Answer 3

以下内容对您有用：

ALTER TABLE `ml_n1` CHANGE COLUMN `add` `addmovie` tinyint(4);

反向标记允许您引用包含保留字或空格等的列名。
我个人习惯在用MySQL编码时在表和列引用周围放置反引号。

Answer 4

在列名称周围使用反引号

    mysql>alter table m1_n1 change `add` addmovie tinyint(4);

重命名名为＆＃34的列;添加＆＃34;在mysql中

4 个答案: