Nora's Bagel Bin Database Blueprints Data Management - Applications - VHT2 A.
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Course
Data Management
Institution
Data Management
Nora's Bagel Bin Database Blueprints Data Management - Applications - VHT2
A.
Nora’s Bagel Bin Database Blueprints
First Normal Form (1NF)
BAGEL ORDER
PK Bagel Order ID
PK Bagel ID
Order Date
First Name
Last Name
Address 1
Address 2
City
State
Zip
Mobile Phone
Deli...
Nora's Bagel Bin
Database Blueprints Data
Management - Applications -
VHT2
A.
Nora’s Bagel Bin Database Blueprints
First Normal Form (1NF)
BAGEL ORDER
PK Bagel Order ID
PK Bagel ID
Order Date
First Name
Last Name
Address 1
Address 2
City
State
Zip
Mobile Phone
Delivery Fee
Bagel Name
Bagel Description
Bagel Price
Bagel Quantity
Special Notes
,The table is in the First Normal form, as it satisfies the following requirements:
• Have a unique identifier (primary key)
• Don’t have any repeating columns
• Don’t have any columns that hold more than value
A composite primary key is created with Bagel Order ID and Bagel ID as the unique identifier for the records in the table above.
A1.
Second Normal Form (2NF)
BAGEL ORDER BAGEL ORDER LINE ITEM BAGEL
PK Bagel Order ID PK / FK Bagel Order ID PK Bagel ID
Order Date 1:M PK / FK Bagel ID M:1 Bagel Name
First Name Bagel Quantity Bagel Description
Last Name Bagel Price
Address 1
Address 2
City
State
Zip
Mobile Phone
Delivery Fee
Special Notes
, The tables are in the Second Normal form, as it satisfies the following requirements:
• It is in the 1st NF.
• Each non-key attribute is fully functionally dependent on the primary key.
The table is reduced into 2nd normal form by splitting the BAGEL ORDER table into BAGLE ORDER LINE ITEM with Bagel Order ID,
Bagel ID, Bagel Quantity as its attributes; and BAGEL table with Bagel ID, Bagel Name, Bagel Description, and Bagel Price as its
attributes. It ensures that the tables are in 1st NF and all non-key attributes are fully functionally dependent on the primary key.
The cardinality of the relationship between two tables:
• From the tables BAGEL ORDER and BAGLE ORDER LINE ITEM, reading from left to right, there can be many line items for
every order. Reading from right to left, the table indicates that each line item is associated with only one order. Thus,
there exists a One-to-Many relationship between the tables.
• From the tables BAGLE ORDER LINE ITEM and BAGEL, reading from left to right, it says there can be only one bagel for
every line item. Reading from right to left, the table indicates that each bagel is associated with multiple line items. Thus,
a Many-to-One relationship exists between the tables.
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