Dynamic Query using no PL/SQL . Is this Possible ??

Hi Everyone,
Based upon the innery query result , can we have a different outer query I want to know whether this is possible with out PL/SQL.
Example:
This is my inner query :
with q1 as
(select
case when x>500 then 0
else 1
end value
from
table1 )
Here is where I am stopped , I only want to run either of these queries depending upon the value,
I know that i can do it using PL/SQL but I want to know whether we can do it with pure SQL
Some thing like this to happen :
when value=0 : run this query : select * from table2
when value=1 : run this query : select * from table2 join table3 using (col1)
Thanks.
VK

Sure. A little modified way ->
satyaki>
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:01.82
satyaki>
satyaki>
satyaki>select k.deptno,
2         k.empno,
3         k.ename,
4         k.job,
5         k.mgr,
6         k.hiredate,
7         k.sal,
8         k.comm,
9         null dname,
10         null loc
11 from emp k
12 where &eid = 0
13 union all
14 select *
15 from (
16         select *
17         from emp
18         join dept
19         using (deptno)
20       )
21 where &eid = 1;
Enter value for eid: 0
old 12: where &eid = 0
new 12: where 0 = 0
Enter value for eid: 0
old 21: where &eid = 1
new 21: where 0 = 1
    DEPTNO      EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM DNAME          LOC
        10       9999 SATYAKI    SLS             7698 02-NOV-08      55000       3455
        10       7777 SOURAV     SLS                  14-SEP-08      45000       3400
        30       7521 WARD       SALESMAN        7698 22-FEB-81       1250        500
        20       7566 JONES      MANAGER         7839 02-APR-81       2975
        30       7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400
        30       7698 BLAKE      MANAGER         7839 01-MAY-81       2850
        10       7782 CLARK      MANAGER         7839 09-JUN-81       4450
        20       7788 SCOTT      ANALYST         7566 19-APR-87       3000
        10       7839 KING       PRESIDENT            17-NOV-81       7000
        30       7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0
        20       7876 ADAMS      CLERK           7788 23-MAY-87       1100
    DEPTNO      EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM DNAME          LOC
        30       7900 JAMES      CLERK           7698 03-DEC-81        950
        20       7902 FORD       ANALYST         7566 03-DEC-81       3000
13 rows selected.
Elapsed: 00:00:00.32
satyaki>/
Enter value for eid: 1
old 12: where &eid = 0
new 12: where 1 = 0
Enter value for eid: 1
old 21: where &eid = 1
new 21: where 1 = 1
    DEPTNO      EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM DNAME          LOC
        10       9999 SATYAKI    SLS             7698 02-NOV-08      55000       3455 ACCOUNTING     NEW YORK
        10       7777 SOURAV     SLS                  14-SEP-08      45000       3400 ACCOUNTING     NEW YORK
        10       7782 CLARK      MANAGER         7839 09-JUN-81       4450            ACCOUNTING     NEW YORK
        10       7839 KING       PRESIDENT            17-NOV-81       7000            ACCOUNTING     NEW YORK
        20       7566 JONES      MANAGER         7839 02-APR-81       2975            RESEARCH       DALLAS
        20       7876 ADAMS      CLERK           7788 23-MAY-87       1100            RESEARCH       DALLAS
        20       7788 SCOTT      ANALYST         7566 19-APR-87       3000            RESEARCH       DALLAS
        20       7902 FORD       ANALYST         7566 03-DEC-81       3000            RESEARCH       DALLAS
        30       7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0 SALES          CHICAGO
        30       7521 WARD       SALESMAN        7698 22-FEB-81       1250        500 SALES          CHICAGO
        30       7698 BLAKE      MANAGER         7839 01-MAY-81       2850            SALES          CHICAGO
    DEPTNO      EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM DNAME          LOC
        30       7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400 SALES          CHICAGO
        30       7900 JAMES      CLERK           7698 03-DEC-81        950            SALES          CHICAGO
13 rows selected.
Elapsed: 00:00:00.24
satyaki>Regards.
Satyaki De.

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