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Physical Data Modelling diagram - (1 - m) relationship

 
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I have 3 tables( Company, Dept, Employee). Each Company has many Depts and each Dept has many Employee's. How can i mention these table relationships thru Physical Data Modelling diagrams.
 
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Each table would appear as a box. Then draw a one to many association between them. Introduce Calculated Column provides an example where a Customer has many Accounts. This example uses UML data modeling notation although there are other common notations.

- Scott
 
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