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Question 1 ( 2 0 Points ) Consider the following database schema: SUPPLIER ( SName , ItemName, Price ) - supplier SName sells item ItemName

Question 1(20 Points) Consider the following database schema:
SUPPLIER(SName, ItemName, Price)- supplier SName sells item ItemName
at Price.
CUSTOMER(CName, Address)- customer CName lives at Address.
ORDER(CName, SName, ItemName, Qty)- customer CName has ordered
Qty of item ItemName from supplier SName.
ITEM(ItemName, Description)- Information about items.
Further, suppose that you want to add the following constraint to this diagram: Every item
is supplied by some supplier. Draw the EER diagram from which the above schema
might have been derived. Specify (a) keys, (b) structural constraints, and (c) roles (if
this is necessary). For the constraints use both the traditional notation (single/double lines
and numbers across the diamonds) and the ( min,max notation. State clearly any additional
assumptions that you made in designing the ER diagram.
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