Query on column hierachy

I have a problem like this
There is a table which has two columns. (actually we can ignore other columns) say X and Y. entry in Y says that X uses Y. This is soemthing like a hierachy in a mesh structure.
If i do a select on Y i can get the places where Y is used only in one level of the heirachy. (just above level of Y) But I want to get the places where Y is used in all the places not just as direct decendant.
For example say there are 3 entries A,B,C. A use children a1,a2 and a2 use a3. B use b1,a2,b2. C use c1,c2 and c2 use B.
So what i want is when i make a query where entry = 'a3' my expected result should be a2,A,B,c2 and C. Can anyone help me to do this..
Hope this is clear

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Query on column hierachy

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                      TABLE2 TABLE2_2,
                      TABLE2 TABLE2_3,
        WHERE TABLE1.DOCNUMBER = TABLE2_1.DOCNUMBER
        AND       TABLE2_1.KEYID = 1
        AND      TABLE1.DOCNUMBER = TABLE2_2.DOCNUMBER
        AND       TABLE2_2.KEYID = 2
        AND      TABLE1.DOCNUMBER = TABLE2_3.DOCNUMBER
        AND       TABLE2_3.KEYID = 3
        AND TABLE1.CREATE_DATE = sysdateI've also made some test with 'CASE' statement, but I can't convert all values into numbers, so a second query getting all string would be      necessary. But at the moment I've no idea how to get them together.
SELECT X.DOCNUMBER,
                    SUM(X.KEY1), SUM(X.KEY2), SUM(X.KEY3), ...
      FROM
         SELECT TABLE1.DOCNUMBER,
                       (CASE WHEN TABLE2.KEYID = 1 THEN TO_NUMBER(TABLE2.KEYVALUE ELSE 0 END) KEY1,
                        (CASE WHEN TABLE2.KEYID = 2 THEN TO_NUMBER(TABLE2.KEYVALUE ELSE 0 END) KEY2,
                         (CASE WHEN TABLE2.KEYID = 3 THEN TO_NUMBER(TABLE2.KEYVALUE ELSE 0 END) KEY3,
          FROM TABLE1, TABLE2
          WHERE TABLE1.DOCNUMBER = TABEL2.DOCNUMBER
         AND TABLE1.CREATE_DATE = sysdate ) X
        GROUP BY X.DOCNUMBERAny ideas what will be the best methode to do something like this???
What will bring the best performance?
Thanks
chrissy

Hi BluShadow,
with this solution, I will get all values into one column, but I need for every value a single column. My problem was, that some values are numbers and others are strings, so I get two rows for every docnumber in my table, one holding all the sums, the other holding all string values. I need to have them together in one row.
The result of the first example will be the correct one, but I thought there might be an easier solution, than this.
Thanks
chrissy

Query on column hierachy

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