Using select &where

Question

hi ı want to ask about my code
SET SERVEROUTPUT ON
       declare
    sonuc float;
    acildigi_yil NUMBER(4);
    begin
      SELECT AVG(GPA_RESULT)
       into sonuc,acildigi_yil FROM (
       SELECT  oa.ogrenci_no,sum(n.sayisal*dt.kredi)/sum(dt.kredi+0.00000000000001)  GPA_RESULT 
         FROM ders_aktif da,ders_tanim dt,ogrenci_akademik oa,ders_kayit dk, notlar n
         WHERE  da.acildigi_yil=2007 and
                oa.ders_baslama_yil=2007 and
      oa.birim like '1521%' and
      (da.acildigi_donem='1'or
      da.acildigi_donem='2')and
      da.ders_kodu like '1521%' and
      (dt.normal_yariyili=1 or
      dt.normal_yariyili=2)and
      dt.ders_kodu=da.ders_kodu and
      da.acilan_ders_no=dk.acilan_ders_no and
      oa.ogrenci_no=dk.ogrenci_no and
      dk.harf_kodu is not null  and
      dk.y_yil is null and
      dk.harf_kodu=n.tanim and
      n.ortalamaya_kat='1' and
      dk.durum='1' and
      dk.yerine is null AND
      dk.yil<=2007
      group by oa.ogrenci_no);
       dbms_output.put_line('GPA lerin ortalaması='||sonuc);
     end;ı want to retrieve with select "da.acildigi_yil=2007 " . When da.acildigi_yil is what is, ı retrieve with select... is this possible ?
for example in above code. where da.acildigi_yil=2007 and ı want to retrieve 2007 with using select..

Answer 1

thank you very much .this code was for using pivot .
it is ok .
how can ı use in pivot ? because calculate avg(gpa_result) in first select statement so
create or replace
PROCEDURE YILARALIKLIGPADAGILIMI(birimno number,sinif number,aranilan_yil number) AS
a_yil number(4):=aranilan_yil;
gpa_ortalama float;
acyil number(4);
begin
WITH PIVOT_DATA AS (
SELECT AVG(GPA_RESULT),acildigi_yil
INTO gpa_ortalama,acyil
FROM (
SELECT oa.ogrenci_no,sum(n.sayisal*dt.kredi)/sum(dt.kredi+0.00000000000001) GPA_RESULT ,da.acildigi_yil
FROM ders_aktif da,ders_tanim dt,ogrenci_akademik oa,ders_kayit dk, notlar n
WHERE da.acildigi_yil=aranilan_yil and
oa.ders_baslama_yil=a_yil and
oa.birim like birimno||'%' and
(da.acildigi_donem='1'or
da.acildigi_donem='2')and
da.ders_kodu like birimno||'%'  and
(dt.normal_yariyili=1 or
dt.normal_yariyili=2)and
dt.ders_kodu=da.ders_kodu and
da.acilan_ders_no=dk.acilan_ders_no and
oa.ogrenci_no=dk.ogrenci_no and
dk.harf_kodu is not null and
dk.y_yil is null and
dk.harf_kodu=n.tanim and
n.ortalamaya_kat='1' and
dk.durum='1' and
dk.yerine is null
--and
--dk.yil<=aranilan_yil
group by oa.ogrenci_no, da.acildigi_yil
) GROUP BY ACILDIGI_YIL
SELECT * FROM PIVOT_DATA
     PIVOT( AVG(GPA_ORTALAMA) RESULTT FOR ACILDIGI_YIL IN(2007,2006,2005,2004,2003));  
DBMS_OUTPUT.PUT_LINE('gpa ortalaması'||gpa_ortalama);
DBMS_OUTPUT.PUT_LINE('yılı'||"2007_RESULTT");
  DBMS_OUTPUT.PUT_LINE('yılı'||"2006_RESULTT");
   DBMS_OUTPUT.PUT_LINE('yılı'||"2005_RESULTT");
    DBMS_OUTPUT.PUT_LINE('yılı'||"2004_RESULTT");
     DBMS_OUTPUT.PUT_LINE('yılı'||"2003_RESULTT");
END YILARALIKLIGPADAGILIMI;I use avg(gpa_result) in first select statment so ı know ı must use aggregate function inside pivot operation .
so if ı remove avg operaiton in first select statement so errors occurred ı know.