How to alter a field value in MySQL?

To change the values of fields in a MySQL database, you can use the UPDATE statement.

For example, suppose you have a table named “users” with a field called “username,” and you want to change a user’s username from “oldusername” to “newusername,” you can perform the following UPDATE statement:

UPDATE users SET username = 'newusername' WHERE username = 'oldusername';

This will update all records in the “users” table where the username is “oldusername” and change them to “newusername”. You can add additional conditions as needed to limit the records being updated.