rawadbaz

I have two tables in my database, in which i'm getting from one 2 (A,B) fields and from the other 6 fields (C,D,E,F,G,H). What i want is that based on a parameter inserted by the user either a report (A,B,C,D,E) will appear or (A,B,F,G,H). So two fields from the first table are constant and will appear, however based on the user input parameter, either C,D,E will appear with A,B. Or F,G,H. Any idea on what method should i follow please?