Procedure for order by

Question

Hi,
create table test_table (
RID number,
STARTID number,
ENDID number,
ID number);
say im having some 1000 records in this table i need to fetch on the basis of param1 and param2
some times param2 might have value are might not have value
SELECT RID, STARTID, ENDID, ID FROM test_table ;
DECLARE param1 number :=1;
param2 number;
begin
SELECT RID, STARTID, ENDID, ID FROM test_table order by <param1>;
end;
Need to create SP for the above mention condition
Thanks!

Answer 1

The closest I can think of, based on the poor requirements given would be something like...
SQL> var param1 number
SQL> var param2 number
SQL> exec :param1 := 5
PL/SQL procedure successfully completed.At this point param2 is null, so selecting our data...
SQL> ed
Wrote file afiedt.buf
  1* select * from emp order by case when :param2 is not null then decode(:param1,1,empno,2,ename,5,to_char(hiredate,'J')) else null end
SQL> /
     EMPNO ENAME      JOB              MGR HIREDATE                    SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-1980 00:00:00        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-1981 00:00:00       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-1981 00:00:00       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-1981 00:00:00       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-1981 00:00:00       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-1981 00:00:00       2850                    30
      7934 MILLER     CLERK           7782 23-JAN-1982 00:00:00       1300                    10
      7788 SCOTT      ANALYST         7566 19-APR-1987 00:00:00       3000                    20
      7839 KING       PRESIDENT            17-NOV-1981 00:00:00       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-1981 00:00:00       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-1987 00:00:00       1100                    20
      7900 JAMES      CLERK           7698 03-DEC-1981 00:00:00        950                    30
      7902 FORD       ANALYST         7566 03-DEC-1981 00:00:00       3000                    20
      7782 CLARK      MANAGER         7839 09-JUN-1981 00:00:00       2450                    10
14 rows selected.doesn't apply any order to our results
Now if we set param2 to a non null value...
SQL> exec :param2 := 1;
PL/SQL procedure successfully completed.
SQL> select * from emp order by case when :param2 is not null then decode(:param1,1,empno,2,ename,5,to_char(hiredate,'J')) else null end
  2  /
     EMPNO ENAME      JOB              MGR HIREDATE                    SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-1980 00:00:00        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-1981 00:00:00       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-1981 00:00:00       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-1981 00:00:00       2975                    20
      7698 BLAKE      MANAGER         7839 01-MAY-1981 00:00:00       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-1981 00:00:00       2450                    10
      7844 TURNER     SALESMAN        7698 08-SEP-1981 00:00:00       1500          0         30
      7654 MARTIN     SALESMAN        7698 28-SEP-1981 00:00:00       1250       1400         30
      7839 KING       PRESIDENT            17-NOV-1981 00:00:00       5000                    10
      7900 JAMES      CLERK           7698 03-DEC-1981 00:00:00        950                    30
      7902 FORD       ANALYST         7566 03-DEC-1981 00:00:00       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-1982 00:00:00       1300                    10
      7788 SCOTT      ANALYST         7566 19-APR-1987 00:00:00       3000                    20
      7876 ADAMS      CLERK           7788 23-MAY-1987 00:00:00       1100                    20
14 rows selected.The data becomes ordered based on the value in param1, as we've defined.