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How can we alter table to add MySQL virtual GENERATED COLUMNS?
For adding MySQL virtual GENERATED COLUMNS in a table, we can use the same syntax as adding a column just adding “AS(expression)” after the data type. Its syntax would be as follows −
Syntax
ALTER TABLE table_name ADD COLUMN column_name AS(expression);
Example
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)
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