Return all the value in table

Question

Hi Team
I want one query plz help
I have a table emp in that we have empno,ename,sal,comm
like
select empno,ename,comm from emp
where comm=300
it will execute the 300 records
if i did not give any number for comm like null
then i want to execute the all date
i user nvl
like
select empno,ename,comm from emp
where comm=nvl(&comm,comm);
output: wrong.

Answer 1

Yes this is the query i am also using and this is returning the all the rows
SQL> select * from emp where nvl(to_char(comm),'0')=nvl(to_char(&comm),nvl(comm,'0'));
Enter value for comm: ''
old 1: select * from emp where nvl(to_char(comm),'0')=nvl(to_char(&comm),nvl(comm,'0'))
new 1: select * from emp where nvl(to_char(comm),'0')=nvl(to_char(''),nvl(comm,'0'))
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.
Regards,
Navneet