hello world,
what is the difference between 2 table with a relationship and the same 2 table without?
In one word is CONSTRAINT and to be exact FOREIGN KEY Constraints, the Primary Key of one table becomes the FOREIGN KEY Constraint of the second table linking them together. In relational modeling it is determined by Upper and Lower Bound Cardinality, in plain English number of rows. Hope this helps.
http://msdn2.microsoft.com/en-us/library/ms175464.aspx
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