MySQL 如何从MySQL表中更改现有列的名称？

我们可以使用CHANGE语句和ALTER语句一起来更改MySQL表中特定现有列的名称。其语法如下−

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语法

ALTER TABLE table_name CHANGE old_column_name new_column_name datatype;

在这里，

table_name 是要从中删除列的表名。
Old_column_name 是要更改的列的名称。
new_column_name 是要给旧列的名称。

例子

在此示例中，我们正在将 ‘id’ 的列名更改为 ‘studentid’ ，从表格 ‘student_info’ 如下 −

mysql> Select * from Student_info;
+------+---------+------------+------------+
| id   | Name    | Address    | Subject    |
+------+---------+------------+------------+
|  101 | YashPal | Amritsar   | History    |
|  105 | Gaurav  | Chandigarh | Literature |
|  130 | Ram     | Jhansi     | Computers  |
|  132 | Shyam   | Chandigarh | Economics  |
|  133 | Mohan   | Delhi      | Computers  |
+------+---------+------------+------------+
5 rows in set (0.02 sec)

mysql> ALTER TABLE Student_info CHANGE id studentid int;
Query OK, 0 rows affected (0.22 sec)
Records: 0 Duplicates: 0 Warnings: 0

mysql> Select * from Student_info;
+-----------+---------+------------+------------+
| studentid | Name    | Address    | Subject    |
+-----------+---------+------------+------------+
|       101 | YashPal | Amritsar   | History    |
|       105 | Gaurav   | Chandigarh | Literature |
|       130 | Ram     | Jhansi     | Computers  |
|       132 | Shyam   | Chandigarh | Economics  |
|       133 | Mohan   | Delhi      | Computers  |
+-----------+---------+------------+------------+
5 rows in set (0.00 sec)