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How can I check (true/false) if every single entry in table exists in other table?

Posted By: Posted Date: October 15, 2010 Points: 0 Category :ASP.Net

I have 2 tables:

- Salesmen with Pk.SalesmenID
- Appointments with Fk.SalesmenID and busy(bit)

How can I check if every salesmen has at least one appointment

Am I on the right way with statement below, though I got syntax problems

If
(SELECT COUNT(distinct SalesmanID)FROM Appointments)
=
(SELECT COUNT(SalesmanID) FROM Salesmen)

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