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Exam (elaborations)

Data Management - Applications - C170 Performance Labs - uCertify

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Data Management - Applications - C170 Performance Labs - uCertify 1.1.1 - Conceptual Schema - ER Model Tables: Customer, DonutOrder, Donut ans: Customer: PK - CustomerID Rest are customer related fields DonutOrder: FK - CustomerID, FK - DonutID Qty, SpecialNotes Donut: PK - DonutI...

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  • May 23, 2022
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  • 2021/2022
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Data Management - Applications - C170 Performance Labs - uCertify


1.1.1 - Conceptual Schema - ER Model

Tables: Customer, DonutOrder, Donut ans: Customer:
PK - CustomerID
Rest are customer related fields

DonutOrder:
FK - CustomerID,
FK - DonutID
Qty, SpecialNotes

Donut:
PK - DonutID
Rest are donut fields

Relationships:
Customer - 1:n Identifying - DonutOrder
DonutOrder - n:1 Identifying - Donut

Why are the relationships in 1.1.1 Identifying? ans: The PK's of Customer and Donut are included in the
composite primary key of DonutOrder.

2.1.1 - Physical Scheme - ER Model

Tables: Customer, DonutOrder, Donut ans: Customer:
PK - CustomerID
Rest are customer related fields

DonutOrder:
PK- DonutOrderID
FK - CustomerID
FK - DonutID
Rest of order related

Donut:
PK - DonutID
Rest are donut related

Relationships:
Customer - 1:n Non-identifying - DonutOrder
DonutOrder - n:1 Non-identifying - Donut

Why are the relationships in 2.1.1 Non-Identifying? ans: The PK in DonutOrder is a unique key that does
not include FK of other tables.

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