Formulas are generic expressions of calculations or comparisons you want to repeat with different input values. Formulas take input from a window, a database, or a process, such as a payroll run and they return values or messages. Oracle FastFormula is a simple way to write formulas using English words and basic mathematical functions. You can use information from your database in formulas without learning the database structure or a programming language. There are strict rules as to the words and punctuation you must use in a formula so that Oracle FastFormula can correctly perform the calculations and validation you require.
This video demonstrates What is Fast formula and How to write it on Oracle R12 Core HRMS: