Path to profile picture in Moodle?

I was programming something in moodle web-application and was looking into retrieving the path of the user profile images. I assumed I could find the path somewhere in the database but I only got to mdl_user.picture and mdl_user.imagealt, so practically I know who has uploaded a picture but can't get to which picture he/she uploaded. Is there a way to get it from the database? Thanks for your help, OM