How to alter drop all columns that start with a specific string using SQL

Question

I have 1 table with all of my user information. All information is the form of $user.name, $user.date, etc, ($user = username)

I want the user to be able to delete their account and alter the table to drop all of the columns that starts with the string of the user.

How would I do this... right now I am doing it the long way, which is still not working either.

            $sql = "ALTER TABLE userDatabase
        DROP COLUMN `$user.hour`,
        DROP COLUMN `$user.plannerData`,
        DROP COLUMN `$user.eventName`,
        DROP COLUMN `$user.eventStart`,
        DROP COLUMN `$user.eventEnd`,
        DROP COLUMN `$user.eventFreq`,
        DROP COLUMN `$user.eventSlide`";

Answer 1

Delete all that from your database. create a table with all your necessary fields. and use code for registration.

INSERT INTO `usertable` (
   `username`, `hour`, `plannerdata`, `eventname`,
   `eventstart`, `eventend`, `eventfreq`, `eventslide`
) VALUES (
   'datatoenter', 'datatoenter', 'datatoenter', 'datatoenter', 
   'datatoenter', 'datatoenter', 'datatoenter', 'datatoenter'
)

To delete the user data, use

DELETE FROM `usertable` WHERE `username` = 'user'