I am trying to learn AJAX. I had purchased a few books in the matter and looked online but am having trouble finding what I am trying to do.
How do I provide live data on a page from a mysql database that updates itself automatically.
Lets say I am looking at a webpage and someone else adds or changes the data in the database. I want to be able to see that data changed on my screen without any user intervention. How would I do this?

Database: stuff
Username: joe
Password: 1234
Table users
Record: name
Record: email
Record: phone

Lets say I have a page written with php, how would I have a page constantly display the current email and phone of a person the page is displaying?