Rownum and order by as parameter

Question

i want a procedure that will accept the 'from' and 'to' parameter (rownum) for paginaton as well as the order by column also as a parameter( the order by changes based on the parameter) , and my query is using multiple table which doesnt have Unique keys, the pagination is not working poperly at that time..
please have a look in to the procedure..
CREATE OR REPLACE Procedure P_pagination
(cur out sys_refcursor,end1 number,start1 number,ordr number)
as
Var_sql varchar2(4000);
begin
var_sql := ' Select * '||
          ' From '||
          ' (select rownum rwnum,aa.* from ' ||
          ' (select ti.a,t2.a,t3.a,t4.b from t1,t2,t3,t4 where < all the joins> order by '||ordr||' )aa'||
          ' where rownum <='|| end1 ||') ' ||
          ' where rwnum >='|| start1 ;
open cur for var_sql;
end ;
/

Answer 1

If you don't specify explicit ORDER BY clause
Oracle wont guarantee the order of the sort. You specify ORDER BY ID , but
not ORDER BY ID, <<something>> , so you have unrepeatable results. Your order by ID but don't order inside ID. Look:
SQL> select *
  2  from
  3  (select a.*, rownum rnum
  4  from
  5  (select id, data
  6  from t
  7  order by id) a
  8  where rownum <= 150
  9  )
10  where rnum >= 148
11  /
        ID       DATA       RNUM
         0         34        148
         0         54        149
         0         81        150
SQL> select *
  2  from
  3  (select a.*, rownum rnum
  4  from
  5  (select id, data
  6  from t
  7  order by id) a
  8  where rownum <= 151
  9  )
10  where rnum >= 148
11  /
        ID       DATA       RNUM
         0         28        148
         0         34        149
         0         54        150
         0         81        151
SQL> select *
  2  from
  3  (select a.*, rownum rnum
  4  from
  5  (select id, data
  6  from t
  7  order by id, rowid) a
  8  where rownum <= 150
  9  )
10  where rnum >= 148
11  /
        ID       DATA       RNUM
         0         24        148
         0         21        149
         0         35        150
SQL> select *
  2  from
  3  (select a.*, rownum rnum
  4  from
  5  (select id, data
  6  from t
  7  order by id, rowid) a
  8  where rownum <= 151
  9  )
10  where rnum >= 148;
        ID       DATA       RNUM
         0         24        148
         0         21        149
         0         35        150
         0         68        151Rgds.