MySQL GENERATED COLUMN とは何ですか?また、テーブルを作成するときにそれを使用する方法は何ですか?

column_name data_type [GENERATED ALWAYS] AS (expression)
[VIRTUAL | STORED] [UNIQUE [KEY]]

mysql> Create table employee_data(ID INT AUTO_INCREMENT PRIMARY KEY, First_name VARCHAR(50) NOT NULL, Last_name VARCHAR(50) NOT NULL, FULL_NAME VARCHAR(90) GENERATED ALWAYS AS(CONCAT(First_name,' ',Last_name)));
Query OK, 0 rows affected (0.55 sec)

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 |
+------------+-------------+------+-----+---------+-------------------+
4 rows in set (0.00 sec)

mysql> INSERT INTO employee_data(first_name, Last_name) values('Yashpal','Sharma');
Query OK, 1 row affected (0.09 sec)

mysql> INSERT INTO employee_data(first_name, Last_name) values('Krishan','Kumar');
Query OK, 1 row affected (0.09 sec)

mysql> INSERT INTO employee_data(first_name, Last_name) values('Rakesh','Arora');
Query OK, 1 row affected (0.08 sec)

mysql> Select * from employee_data;
+----+------------+-----------+----------------+
| ID | First_name | Last_name | FULL_NAME      |
+----+------------+-----------+----------------+
| 1  | Yashpal    | Sharma    | Yashpal Sharma |
| 2  | Krishan    | Kumar     | Krishan Kumar  |
| 3  | Rakesh     | Arora     | Rakesh Arora   |
+----+------------+-----------+----------------+
3 rows in set (0.00 sec)