删除 mysql 中包含空格的列

Question

我想知道如何在 mysql 中删除包含空格的列。尝试了以下，并得到以下异常：

alter table test17 drop column [added column2];
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 '[added column2]' at line 1

alter table test17 drop column 'added column2';
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 ''added column2'' at line 1

alter table test17 drop column (added column2);
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 '(added column2)' at line 1

谢谢:)

Answer 1

首先，带有 space 的列名是错误的做法。然后，如果您真的想删除列，请改用反引号：

ALTER TABLE test17 DROP COLUMN `added_column2`;

Answer 2

尝试：

alter table test17 drop column `added column2`;

注意引号字符向左倾斜。

顺便说一句，如果您将空格作为标识符名称的一部分（例如函数、过程、表、列等），那将是非常、非常的错误做法.

Answer 3

您应该尝试使用反引号 ("`") 来引用您的列名。

ALTER TABLE test17 DROP COLUMN `added column2`;

或

没有COLUMN词

ALTER TABLE test17 DROP `added column2`;

删除 mysql 中包含空格的列

deleting column containing white spaces in mysql

mysql

linux

mysql-error-1064