Hierarchical tree based on columns in the same row

Hi guys,
I have the following table:
TABLE A:
COL1 COL2 COL3 COL4
1 2 5 8
1 2 6 9
1 3 1 3
1 4 2 4
... then, as I have ordered the info, I want to implement a tree based on every row of my table.
Could you help me with the procedure please??
Thanks.

REPOST

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    Hi,
    Your question do not have anything do with APEX.
    It is pure SQL question and you will get better answer this kind questions from SQL and PL/SQL forum
    You need have GROUP BY when you use aggregate functions like SUM.
    I assume you like just add two columns.
    Try
    SELECT ENTPIDFISC
        ,EXEANNEE
        ,PROJBILTRIMT1PREV
        ,PROJBILTRIMT2PREV
        ,trunc(PROJBILTRIMT1PREV) + (PROJBILTRIMT2PREV)
    FROM TR_PROJ_BIL_TRIM
    Regards,
    Jari

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