selecting multiple times from two tables to get two different result - sql

Question

I am using apex application building to create a report.
Table
staff
id name
201 john
302 sarah
787 bob
product
product_editor_id product_name
201 car
307 shoe
728 airbag
as you can see in the staff table I have staff details and in the product I have the staff id to show the staff that created it.
in my report I have selected everything from the staff table, but you see where I have staff id i don't want to show the id but instead their name
I have rewritten a query for this. The reason why I am asking this question is that in the previous query I had something like this
select * from staff Inner join
company_car ON
staff.staff_car_id=company_car.vehicle_id_staffid
if that query doesn't make sense. Basically I did this to only display staff that has a company car and the vehicle_id_staffid is the same as the staff id.
anyways on top for that query I need to add my new query to it which is
select distinct name from staff
left join product on
staff.id=product.product_editor_id
I tried
select * from staff Inner join
company_car ON
staff.staff_car_id=company_car.vehicle_id_staffid
UNION
select distinct name from staff
left join product on
staff.id=product.product_editor_id
but apex said ORA-01789: query block has incorrect number of result columns
I want the result from it to be different. The first query should have any problem with the second query because they are but doing their own thing.

Answer 1

Probably the easiest way would be to create original report with staff_id in it.So
create new report as new page or as region on the page.
-something like :
Select * from company_car
So you get report that will have staff_id as one of the columns.Then you edit page properties and go to report.
Select report attributes and from the list of columns you have in the report you chose staff_id column edit ( pencil icon on the left).
Go to display as and select 'Display as Text based on LOV dont save state'
List of value will appear. Go to list of values section
and type :
select id r, name d from staff;
or
select id r, name||' '||surname d from staff;
in here you need to link staff_id with name and their surname which will be displaying on the report instead of meaningless id. Alternatively you can create static LOV and use it to populate this column or you can try to build JOIN statement.