oracle - Select sum query does not work while implemented in a function/procedure -

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i came cross problem when using 2 sum() in function called procedure. results inputted came separate. following tables, function , procedure tried. p.s. - works fine when there single sum(x). 

 drop table match;     create table match         (m_id varchar2 (4) not null,         ht_id varchar2 (4),         at_id varchar2 (4),         p_f number (3),       p_a number (3));   insert match values ('m01','t1', 't2',  2, 0);  insert match values ('m02','t1', 't2',  1, 1);  insert match values ('m03','t1', 't2',  0, 2);  insert match values ('m04','t1', 't2', 0, 2);  insert match values ('m05','t2', 't1', 2, 0);  insert match values ('m06','t2', 't1',  0, 2);  insert match values ('m07','t2', 't1',  1, 2);  insert match values ('m08','t2', 't1',  0, 2);

temp table (where results stored):

drop table results; create global temporary table results (ht_id varchar2 (5),  final number (2))  on commit preserve rows;   insert results values('t1', null);  insert results values('t2', null);  insert results values('t3', null);  insert results values('t4', null);  insert results values('t5', null);

query applied:

select sum(case when ht_id='t1' p_f else 0 end) + sum(case when at_id='t1' p_a else 0 end) match;

returns result of 9, applied select query in function , made procedure call function , store results in temp table. although result of sum done in function comes separate (e.g. 6 t1 , 3 t2, although 9 points should t1 alone).

ht_id      final ----- ---------- t1             3 t2             6 t3             0 t4             0 t5             0

how can retain same result query , input them temp table? like below:

ht_id      final ----- ---------- t1             9 t2             0 t3             0 t4             0 t5             0

this tried in regards of function , procedure:

 drop function resultsfinal;  create or replace function resultsfinal(i_ht_id results.ht_id%type)   return varchar2    v_results_final  results.final%type;   begin  select sum(case when ht_id='t1' p_f else 0 end)+ sum(case when at_id='t1'    p_a else 0 end)  v_results_final  match  ht_id = i_ht_id;   if v_results_final null   v_results_final := 0; end if; return v_results_final; end; /

the procedure:

    create or replace procedure finalscores          cursor c_results           select ht_id      results;       v_ht_id  results.ht_id%type;     v_results_final  results.final%type;      begin        open c_results;       loop      fetch c_results v_ht_id;      exit when c_results%notfound;       v_results_final := resultsfinal(v_ht_id);       update results      set final = v_results_final      ht_id = v_ht_id;      end loop;    close c_results;     end;     /

execute finalscores;

thanks in advance.

select    sum(case when ht_id=i_ht_id p_f else 0 end)   + sum(case when at_id=i_ht_id p_a else 0 end) v_results_final match;

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