I am trying to code a website where users have profile pages. I want them to be able to edit their profile information that they have already entered. But there is an about me section where users are expected to include a large amount of detail about themselves. 
I have used the SQL UPDATE statement which works fine to override the data which is already there but I'm wondering if there is a way to extract the data that is there and allow the user to edit this and then post the updated version back to the table?
Any help on an approach to this would be great.