I'm not sure but if Employee_Id field has 0 nulls maybe other field such as Dealer Name or emp_name_display or any other field might have null value hence the Employee_Id shows no record for it?
Maybe few of the Dealer Names has no Employee_Id?
Check your db for any nulls.
Another way to check this is in UI make list boxes or a table box to check if there are any nulls in front end as well?
Or Does it have -1 or Unknown or - as a value in any of the fields in Employee_Data Table.
I'm sure there must be a better way to check for nulls but I personally check for nulls in my dashboard.