How to create virtual column using MySQL SELECT?

To create a virtual column using a MySQL SELECT statement, you can use the AS keyword to assign a name to an expression in the SELECT statement. For example:

SELECT column1, column2, column1 + column2 AS virtual_column
FROM table_name;

This would select column1, column2, and a virtual column named virtual_column that is the result of the expression column1 + column2.

It's important to note that the virtual column is not physically stored in the table, it's only available for the specific SELECT statement.

Also, starting from MySQL 8.0, MySQL support computed columns which are virtual columns that are stored in the table and are updateable. You can create a computed column like this:

ALTER TABLE table_name ADD COLUMN virtual_column AS (column1 + column2);