New to Oracle Report .....run/display 2 queries depending on parameter

Question

I am developing 2 report where the output is almost same except for 2 rows .Those 2 row should be extracted from Employee table if the parameter specified is E or should be extracted from Salary table if parameter specified is S.
In short the report should look like
parameter E
----------1----------------
MICROSOFT
Bill Gate
United States
Huge organization
Employee
George Bush
Dick Cheney
parameter S
----------2----------------
MICROSOFT
Bill Gate
United States
Huge organization
Salary
100000
200000
Please advice as how to go about doing this.

Answer 1

Well, if it's only about 1-2 non-repeating values that need to be computed and displayed conditionally, then, the best approach would be to have for them two user parameters, such as :p_u1 and :p_u2.
Then, say in the afterpform trigger you may have something like:
if :p_s='S' then
--- those below being selects that return single values
select ... into :p_u1 from ... where ...
select ... into :p_u2 from ... where ...
end if;
Then, for having the values conditionally printed, you may use the format trigger for the fields, or, eventually, for the frames that contain the fields and some aditional text that is to be printed.
If it's to be a query that returns a number of rows that has to be conditionally printed, then, in the query you may put an aditional condition in the where clause. And in the layout you may put the repeating frame for that query and tha column headers text within a frame that has a format trigger for printing conditionally.