Display 0 if there is no data for that corresponding match

Question

Suppose we have an employee table with columns employee_id and first_name. In case there is no matching data, the result should display zero.
EXAMPLE:
Employee_ID               FIRST_NAME
============================
10                               Harry
20                               Larry
select employee_id from employees
where first_name='Jack';
This will return an exception NO_DATA_FOUND, but I want to show 0. Is this possible?

Answer 1

adfSonal wrote:
Suppose we have an employee table with columns employee_id and first_name. In case there is no matching data, the result should display zero.
EXAMPLE:
Employee_ID               FIRST_NAME
============================
10                               Harry
20                               Larry
select employee_id from employees
where first_name='Jack';
This will return an exception NO_DATA_FOUND, but I want to show 0. Is this possible?
So many unanswered questions, this is really really hard to answer.
If you are trying to do it in SQL, we can provide 1 answer.
If you are trying to do it in PL/SQL, you may get a completely different answer.
What column(s) do you want to show 0 for? All of them? one of them?
Please be specific.
More information is better.
The simplest way is probably:
select NVL(e.emp_id, xx.emp_id), NVL(e.first_name, xx.first_name) first_name
  from employees e
       FULL OUTER JOIN
       (select 0 emp_id, null first_name from dual ) xx
      ON xx.emp_id = e.emp_id;