IF LOGIC

hi

i need to know how to see previous value

example, i have two coumns

           category       reason        program

            active            open             1

now for category      reason we can have following value

             active           open

             inactive        close

            not avaiable   

            not rechable

Now if value for category change to inactive and close , i need to do print something.thsi is in stored proc , so each time when u run either it is active or inactive. i  want to know previosuly for that particular program if was open and active

and now its closed and inactive.

any help