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database structures and foreign keys

Thread began 8/03/2009 8:17 am by jenkolaka19379118 | Last modified 8/07/2009 4:54 pm by jenkolaka19379118 | 3734 views | 7 replies

Jason ByrnesWebAssist

In the Blue Sky Music sample database, there are a few relations in place:
Items.ItemcatID is a forign key relation to itemcategory.ItemcatID

orderdetails.DetailOrderID is a foreign key relation to orders.OrderID

orders.OrderStatus is a foreign key relation to orderstatustypes.StatusID

visitors.VisitorGroupID is a foreign key relation to groups.GroupID

making the foreign key relation in the MySQL database allows you to force referential integrity. This means that you would not be able to delete a child record with out first deleting the parent.

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