HOW TO CREATE A VIEW WHICH CONTAINS A PARAMETER

Question

Hi all
I am trying to create a view which contains paramaters.
Lets assume that the view may look like this:
STEP 1:
CREATE OR REPLACE procedure Myproc(v_count in NUMBER) as
BEGIN
EXECUTE IMMEDIATE
'CREATE OR REPLACE VIEW myview AS
SELECT COUNT(*) FROM DUAL WHERE ROWNUM like '''||v_count||'%'' ';
END myproc;
SHOW ERRORS;
Procedure created.
Elapsed: 00:00:00.31
SQL> SHOW ERRORS;
No errors.
STEP 2:
SQL> EXEC Myproc(2);
BEGIN Myproc(2); END;
ERROR at line 1:
ORA-00998: must name this expression with a column alias
ORA-06512: at "MYUSERNAME.MYPROC", line 3
ORA-06512: at line 1
Elapsed: 00:00:00.16
It seems that doesn't really likes the third line: "EXECUTE IMMEDIATE".
Can I get any help with this one ?
Thank-you
Robert

Answer 1

Bear in mind that VIEWs are not supposed to be parameterised. That is why Nature gave us a WHERE clause. However, there is one, albeit slightly clunky, way of doing it....
SQL> CREATE OR REPLACE VIEW emp_view AS
  2  SELECT * FROM scott.emp
  3  WHERE deptno = sys_context('userenv','client_info')
  4  /
View created.
SQL>
SQL>
SQL> exec dbms_application_info.set_client_info(10)
PL/SQL procedure successfully completed.
SQL> SELECT * FROM emp_view
  2  /
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM
    DEPTNO
      7782 CLARK      MANAGER         7839 09-JUN-81       2450
        10
      7839 KING       PRESIDENT            17-NOV-81       5000
        10
      7934 MILLER     CLERK           7782 23-JAN-82       1300
        10
SQL> Cheers, APC