RELATED TO QUERY DESIGNER ABOUT NEW SELECTION,CONDITION,EXCEPTIONS,TEXT VARIBLES,FORMULA VARIABLES

1.WHAT IS THE USE OF NEW SELECTION,CONDITION AND NEWFORMULA.WHEN WILL USE THIS OPTONS

2.WHY WE USE CHARACTERISTIC VALUE VARIABLE,TEXT VARIABLE AND FORMULA VARIABLE ?

3.WHAT IS THE DIFFERENCE BETWEEN FORMULA VARIABLE AND NEW FORMULA

4.WHAT IS GLOBAL AND STATIC FILTER AND HOW THEY ARE DEFINED