Problem returning same rows multiple times

Hi there. I have three tables called GP_T, LDMK_T, and FP_T.
GP_T is a spatial table and has the following attributes:
Location | Land - where location is of type sdo_geometry
LDMK_T has the following attributes:
Land | CFCC
FP_T has the following attributes:
Land | CFCC | Score
Each land is assoicated with only one location. As can be seen the attribute "Land" is common to all three tables and uniquely identifies the objects that I am trying to access. "CFCC" is common to LDMK_T and FP_T and each unique object has an associated "CFCC" where more than one object can have the same "CFCC". Essentially what I am trying to do is return all distinct "lands" based on a "CFCC" value and where the objects' score > 20.
My select statement looks as follows:
select a1.land, a1.location from GP_T a1, LDMK_T a2, FP_T a3
where a1.land = a2.land and a1.land = a3.land and a2.cfcc = a3.cfcc
and a2.cfcc = 'D43' and a3.feature_score > 20;
However, this query returns certain objects multiple (2 or more) times. When I run this second query it appears to return the correct number of values but without the "Location" attribute:
select distinct (a1.land) from GP_T a1, LDMK_T a2, FP_T a3
where a1.land = a2.land and a1.land = a3.land and a2.cfcc = a3.cfcc
and a2.cfcc = 'D43' and a3.feature_score > 20;
I cannot use "select distinct a1.land, a1.location...." as it throws up the following error:
ORA-22901: cannot compare nested table or VARRAY or LOB attributes of an object type
Is it a question of using GROUP_BY or can anybody else see anything wrong with the way I set up the initial query. Any help would be greatly appreciated. Joe

Hi there. Thanks a lot for your response. I tried removing the second table completely from the query as you suggested, seeming as it appears redundant, but the query still retrieves certain rows multiple times. In fact the query that you suggested actually returns the exact same results as my initial query so at least some progress has been made. However, I really have no idea how to remove duplicates without using the "DISTINCT" option. Has anybody else got any further suggestions? Any help would be great. Thanks, Joe

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