Question

I have a table emp having foll data:

EmpID    EmpName   MgrID 

100     King        NULL
101     Smith       100
102     Shine       100
103     Racy        102

Now i want to Display the Employee Name (Boss) and number of Employee (Subordinates) something like this

BOSS       SUBORDINATES

---

BLAKE                 5

CLARK                 1

FORD                  1

JONES                 2

KING                  3

SCOTT                 1

Please guide how to go about querying this table in SQL Server 2008.

Attempted query:

select e.first_name as ename,m.first_name as mname from employees e,employees m where e.manager_id=m.employee_id

Answer 1

• Start by self-joining on EmpID=MgrID
• Group by MgrID and EmpName
• Select EmpName and count(*)

Translating this to SQL is mechanical:

SELECT b.EmpName, COUNT(*)
FROM Employee e
JOIN Employee b ON b.EmpID=e.MgrID
GROUP BY b.EmpID, b.EmpName