在mysql中删除包含空格的列

Question

我想知道如何在mysql中删除包含空格的列。 试过以下，并得到了以下情况除外：

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

您应该尝试使用back tick（“`”）来引用您的列名称。

ALTER TABLE test17 DROP COLUMN `added column2`; 

OR

无柱字

ALTER TABLE test17 DROP `added column2`; 

Answer 2

首先，空间列名是不好的做法。然后，如果你真的想删除一列，用反引号代替：

ALTER TABLE test17 DROP COLUMN `added_column2`; 

Answer 3

尝试：

alter table test17 drop column `added column2`; 

注意，引号字符向左倾斜。顺便说一句，如果你将空格作为标识符名称的一部分（例如函数，过程，表格，列等），这是一个非常糟糕的做法。