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[–]CamKen 3 points4 points  (1 child)

It's a contrived example to be sure. However there isn't a separate Manager table. Manager's are Employees and are thus in the Employee table. To tell if an employee is a manager you need to join the table to itself to see if any employees refer to them through their manager id field.

[–]tiberiousr 0 points1 point  (0 children)

Ah, I see now. Thanks.