SQL Query drove me mad !

Question

Dear all,
I'm requesting any advice related to this query I'm stuck with.
this Query is for an assessment (homework)
I got three tables:
Property: Property_id(PK) , Property_Type_id(FK)
Property_Type: Property_Type_id(PK), Type
Viewing: Property_id(PK), Buyer_id(PK)
the question supplied by the tutor is :
List those properties of each type which have the highest number of viewings
arranged.
I managed to get the number of views for each property, grouping them by the type of the property. the bit I'm struggling with is how to show only one property of each type that have the max number of views.
I have the following query made:
select PT.type_description "Type", V.property_id "Property",count(V.property_id) "no. views"
     from Viewing V, Property P, Property_Type PT
     where V.property_id = P.property_id
     and P.prop_type_id = PT.prop_type_id
     group by PT.type_description, V.property_id;
when I try to implement the max as in : max(count(V.property_id))
it generates an error.
regards

Answer 1

I came up with this. (Because I don't have your tables, I had to use your original results as the innermost table.)
SQL> select prop_type, prop_no, views
  2  from
  3  (
  4     select prop_type
  5           ,prop_no
  6           ,views
  7           ,dense_rank() over (partition by prop_type order by views desc) dr
  8     from
  9     (
10        select prop_type
11              ,prop_no
12              ,views
13        from   prop_views
14     )
15  )
16  where dr = 1;
PROP_TYPE                      PROP_NO                             VIEWS
Detached                       A0004                                   2
Semi Detached                  A0013                                   3
Semi Detached                  A0016                                   3
Terrace                        A0001                                   2
Terrace                        A0002                                   2
Town House                     A0007                                   2
Town House                     A0010                                   2
Town House                     A0020                                   2
8 rows selected.You can see there are multiple properties within each type with the same maximum number of views.
Do you have any logic for choosing one over the other?