Question

I previously created this SELECT command in SQL Server, that needs to count how many Employees each Department contains.
This is what I used:

SELECT Departments.Description AS [Department], COUNT(Employees.ID) AS [Employees]
FROM Employees 
RIGHT JOIN Departments ON
Employees.DepartmentID = Departments.ID 
GROUP BY Departments.Description

And it works fine (also shows the Department, even if there are no Employees).

Now, I want to count only the currently working employees, by the following filter:

WHERE Employees.JobEndDate = null

And I tried doing this:

SELECT   Departments.Description AS [Department], COUNT(Employees.ID) AS [Employees] 
FROM Employees 
RIGHT JOIN Departments ON
Employees.DepartmentID = Departments.ID 
WHERE Employees.JobEndDate = NULL 
GROUP BY Departments.Description

But now I get no results.
Any idea what I’m doing wrong?

Thanks 🙂
Mitsy.

Answer 1

Testing if a field returned value is NULL is not performed through equal = sign but with IS operator

= null

doesn’t work, instead write:

Employees.JobEndDate IS NULL