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constraints

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I've to set up a test database using Groff tables&nbsp;&nbsp;Anyway, in inputting the Groff stuff I was going to create a constraint on the<br>Manager column of the Salesreps table. Reason behind my thinking - the manager<br>has an Empl_Num. The Empl_Num is the Salesreps pk. Want to be able to check the<br>manager against the empl_num. However, consider this - not every employee will<br>necessarily report to a manager, so I want to allow the manager column to hold a<br>null value where necessary. Can I creat such a constraint and if so how?
 
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