Kushika

I've got a cell that contains a number, and it is likely for hat number to increment or decrement itself on a ragular basis. Could someone briefly explain how it would be made for the number to adjust automatically? For example, lets say that that cell is driven by a database, if I import data from a database, and then the information in the db changes, will Excel adjust accordingly? Please help -- I'm really stuck on this. It's part of some coursework I'm doing and I'm desperate for an answer.