Không thể sử dụng tên bảng PL / SQL làm biến trong thủ tục PL / SQL?

Tôi giải quyết nó mà không cần sử dụng EXECUTE IMMEDIATE , Tôi không biết giải pháp này có được coi là SQL động hay không, phần khó nhất là nối truy vấn phức tạp lớn này vào biến chuỗi.

SET SERVEROUTPUT ON SIZE 1000000;
DECLARE
--FIRST DAY YEAR
v_SG_FYEAR VARCHAR(50);
--FIRST DAY MONTH
v_SG_FMNTH VARCHAR(50);
--FIRST DAY START DAY
v_SG_FDAY VARCHAR(50);

--LAST DAY MONTH
v_SG_LYEAR VARCHAR(50);
--LAST DAY MONTH
v_SG_LMNTH VARCHAR(50);
--LAST DAY START DAY
v_SG_LDAY VARCHAR(50);

v_JOBID number(20);
v_PRM_TABLE1 varchar(200);
v_PRM_TABLE2 varchar(200);
--craeting a data type
type t_rec is record(SGSN_DATE VARCHAR2(200),
                 SGSN_MB VARCHAR2(200),
                 PRM_MNTH VARCHAR2(200),
                 PRM_ACT_MB VARCHAR2(200),
                 PRM_RND_MB VARCHAR2(200),
                 PRM_CHRG_USD VARCHAR2(200));
v_REC t_rec;
C1 sys_refcursor;
v_sql varchar2(32767);
BEGIN
/*Getting last JOB_ID*/
SELECT MAX(JOB_ID) INTO v_JOBID from ON_SGSN_TAPOUT;
case when v_JOBID IS NULL then v_JOBID:=1;
 when v_JOBID IS NOT NULL THEN 
      SELECT MAX(JOB_ID)+1 INTO v_JOBID FROM ON_SGSN_TAPOUT;
 END CASE;
v_SG_FYEAR:=TO_CHAR(TRUNC(SYSDATE,'MM')-1,'YYYY');
v_SG_FMNTH:=TO_CHAR(TRUNC(SYSDATE,'MM')-1,'MM');
v_SG_FDAY:='01';
v_SG_LYEAR:=TO_CHAR(TRUNC(SYSDATE,'MM')-1,'YYYY');
v_SG_LMNTH:=TO_CHAR(TRUNC(SYSDATE,'MM')-1,'MM');
v_SG_LDAY:=TO_CHAR(TRUNC(SYSDATE,'MM')-1,'DD');
v_PRM_TABLE1:='prmdb.CDR_TAPOUT_'||v_SG_FYEAR||v_SG_FMNTH||'@prmdb';
v_PRM_TABLE2:='prmdb.CDR_TAPOUT_'||TO_CHAR(SYSDATE,'YYYYMM')||'@prmdb';

/*putting the SQL query into a variable*/
v_sql:='select * from('||
   'select * from ('||
   'SELECT TO_CHAR(START_TIME,''YYYYMMDD'') AS "SGSN_DATE",'||
   'SUM(SUM_UP_DOWN/1024/1024) SGSN_MB'||
   ' FROM [email protected]'|| 
   ' WHERE START_TIME BETWEEN 
TO_DATE('''||v_SG_FMNTH||'/'||v_SG_FDAY||'/'||v_SG_FYEAR||' 
'||'00:00:00'||''','||'''mm/dd/yyyy hh24:mi:ss'||''')'||
' AND  TO_DATE('''||v_SG_LMNTH||'/'||v_SG_LDAY||'/'||v_SG_LYEAR||' 
'||'23:59:59'||''','||'''mm/dd/yyyy hh24:mi:ss'||''')'||
' GROUP BY TO_CHAR(START_TIME,''YYYYMMDD'')) A '||
'left outer join '|| 
'('||
'select PRM_MNTH,PRM_ACT_MB,PRM_RND_MB,PRM_CHRG_USD from ('||
'select PRM_MNTH,SUM(PRM_ACT_MB) PRM_ACT_MB,SUM(PRM_RND_MB) 
 PRM_RND_MB,SUM(PRM_CHRG_USD) PRM_CHRG_USD  from ('||
 'select substr(START_TIME,1,8) PRM_MNTH,sum(TOTAL_BYTE)/1024/1024 PRM_ACT_MB, 
 sum(charged_units)/1024/1024 PRM_RND_MB, sum(tap_fee_usd) PRM_CHRG_USD'||
 ' from '|| v_PRM_TABLE1 ||
 ' where start_time between '''||v_SG_FYEAR||v_SG_FMNTH||v_SG_FDAY||'000000'' and 
 '''||v_SG_LYEAR||v_SG_LMNTH||v_SG_LDAY||'235959'''|| 
 ' and CDR_TYPE in (''GPRSO'') '||
 ' group by substr(START_TIME,1,8) '||
 ' UNION ALL '||
 ' select substr(START_TIME,1,8) PRM_MNTH,sum(TOTAL_BYTE)/1024/1024 PRM_ACT_MB, 
 sum(charged_units)/1024/1024 PRM_RND_MB, sum(tap_fee_usd) PRM_CHRG_USD '||
 ' from '||v_PRM_TABLE2||
 ' where start_time between '''||v_SG_FYEAR||v_SG_FMNTH||v_SG_FDAY||'000000'' and 
 '''||v_SG_LYEAR||v_SG_LMNTH||v_SG_LDAY||'235959'''|| 
 ' and CDR_TYPE in (''GPRSO'')'||
 ' group by substr(START_TIME,1,8))'||
 ' group by'||
 ' PRM_MNTH)'||
 ') B'||
 ' ON A.SGSN_DATE=B.PRM_MNTH)';  
   OPEN C1 FOR v_sql;
   LOOP
   FETCH C1 INTO v_REC;
   EXIT WHEN C1%NOTFOUND;
   dbms_output.put_line(v_REC.SGSN_DATE||' '||v_REC.SGSN_MB||' '||v_REC.PRM_MNTH||' 
   '||v_REC.PRM_ACT_MB||' '||v_REC.PRM_RND_MB||' '||v_REC.PRM_CHRG_USD||' '||SYSDATE);
   END LOOP;
 END;
 /