要在表中新增MySQL 虛擬生成列，我們可以使用與新增列相同的語法，只需在資料類型後面新增「AS(表達式)」即可。其語法如下 -
ALTER TABLE table_name ADD COLUMN column_name AS(expression);
mysql> ALTER TABLE employee_data ADD COLUMN FULLName Varchar(200) AS(CONCAT_WS(" ", 'First_name','Last_name'));
Query OK, 0 rows affected (0.49 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> Describe employee_data;
+------------+--------------+------+-----+---------+-------------------+
| Field | Type | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+-------------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| First_name | varchar(50) | NO | | NULL | |
| Last_name | varchar(50) | NO | | NULL | |
| FULL_NAME | varchar(90) | YES | | NULL | VIRTUAL GENERATED |
| FULLName | varchar(200) | YES | | NULL | VIRTUAL GENERATED |
+------------+--------------+------+-----+---------+-------------------+
5 rows in set (0.00 sec)以上是我們如何更改表以新增 MySQL 虛擬生成列？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
