How to get count as 0 for records not in table

Question

Hi All,
I have requirement where I need count of records in the table based on ids. Example query below
SELECT empid ,
nvl(COUNT(id), 0) empcount
FROM employee
WHERE empid IN(1, 2, 4, 5)
GROUP BY empid
In the table only record for "empid=2" is present so I get count 1 for it. But with it I should get count as 0 for non existing records. Expecting below output
empid | empcount
1 | 0
2 | 1
4 | 0
5 | 0
Appreciate your help and Thanks in advance.
Regards.
Ashish

Answer 1

e.g.
SQL> select column_value deptno, count (deptno)
from emp, table (sys.odcinumberlist (10, 20, 100))
where deptno(+) = column_value
group by column_value
    DEPTNO COUNT(DEPTNO)
        10             3
        20             5
       100             0
3 rows selected.