We have a webform and our clients can register for an event using this webform, some of fields are preloaded in the form like *"firstname"* or *"lastname"*, but i like to update the user info in the user's table in case if the user change his/her info in the event registration webform.

I like to know also how can I update user info using single query because when I look at Drupal database, every single info is in different table like *'field\_data\_field\_first\_name'* !

*I'm not really experienced in Drupal development, so thx for ur help.*