在mysql中刪除包含空格的列

Question

我想知道如何在mysql中刪除包含空格的列。 試過以下，並得到了以下情況除外：

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 

謝謝:)

Answer 1

您應該嘗試使用back tick（「`」）來引用您的列名稱。

ALTER TABLE test17 DROP COLUMN `added column2`; 

OR

無柱字

ALTER TABLE test17 DROP `added column2`; 

Answer 2

首先，空間列名是不好的做法。然後，如果你真的想刪除一列，用反引號代替：

ALTER TABLE test17 DROP COLUMN `added_column2`; 

Answer 3

嘗試：

alter table test17 drop column `added column2`; 

注意，引號字符向左傾斜。順便說一句，如果你將空格作爲標識符名稱的一部分（例如函數，過程，表格，列等），這是一個非常糟糕的做法。