Normalizing TAL Example€¦ · Second Normal Form – Removal of Partial Dependencies...

Normalizing TAL Example

TAL Example Unnormalized

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Item (ItemNum, Description, OnHand, Category, Price, (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice))

Functional Dependency Diagram

TAL Example Unnormalized

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Item (ItemNum, Description, OnHand, Category, Price, (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice))

Functional Dependency Formula Primary Key: (ItemNum) F(ItemNum) Description, OnHand, Category, Price, OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice

TAL Example Unnormalized

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Item (ItemNum, Description, OnHand, Category, Price, (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice))

What does the data table look like?

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price) Orders (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice, ItemNum)

Functional Dependency Diagram

3NF

1NF

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price) Orders (OrderNum, OrderDate, (CustomerNum, CustomerName, RepNum, LastName, FirstName), NumOrdered, QuotedPrice, ItemNum)

Functional Dependency Formula Primary Key: (ItemNum) F(ItemNum) Description, OnHand, Category, Price Primary Key: (OrderNum) Foreign Key: (ItemNum) F(OrderNum) OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice, ItemNum

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price) Order (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice, ItemNum)

What does the data table look like?

Item Table is Fine

Still have repeating groups

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price) Orders (OrderNum, OrderDate, (CustomerNum, CustomerName, RepNum, LastName, FirstName), NumOrdered, QuotedPrice, ItemNum)

Functional Dependency Formula Primary Key: (ItemNum) F(ItemNum) Description, OnHand, Category, Price Primary Key: (OrderNum) Foreign Key: (ItemNum) F(OrderNum) OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName, NumOrdered, QuotedPrice, ItemNum

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price Orders(OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName) OrderLine(OrderNum, ItemNum, NumOrdered, QuotedPrice)

3NF

3NF

2NF

TAL Example First Normal Form – Removal of Repeating Groups

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Item (ItemNum, Description, OnHand, Category, Price) Orders (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName) OrderLine (OrderNum, ItemNum, NumOrdered, QuotedPrice) What does the data table look like?

TAL Example Second Normal Form – Removal of Repeating Groups and no

KEY Dependancies (Partial Dependancies)

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Orders(OrderNum, OrderDate, (CustomerNum, CustomerName, (RepNum, LastName, FirstName) ))

TAL Example Second Normal Form – Removal of Partial Dependencies

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Orders (OrderNum, OrderDate, CustomerNum, CustomerName, (RepNum, LastName, FirstName) Functional Dependency Formula Primary Key: (OrderNum) F(OrderNum, CustomerNum) OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName

TAL Example Second Normal Form – Removal of Partial Dependencies

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Orders (OrderNum, OrderDate, CustomerNum, CustomerName, RepNum, LastName, FirstName)

What does the data table look like?

TAL Example Second Normal Form – Removal of Partial Dependencies

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Orders(OrderNum, OrderDate, (CustomerNum, CustomerName, (RepNum, LastName, FirstName) ))

3NF

2NF

TAL Example Second Normal Form – Removal of Partial Dependencies

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Orders (OrderNum, OrderDate, CustomerNum) Customer (CustomerNum, CustomerName, (RepNum, LastName, FirstName))

Functional Dependency Formula Primary Key: (OrderNum) Foreign Key: (CustomerNum) F(OrderNum, CustomerNum) OrderDate, CustomerNum Primary Key: (CustomerNum) F(CustomerNum) CustomerName, RepNum, LastName, FirstName

TAL Example Second Normal Form – Removal of Partial Dependencies

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Orders (OrderNum, OrderDate, CustomerNum, Customer (CustomerName, RepNum, LastName, FirstName)

What does the data table look like?

Order table in 3NF

TAL Example Third Normal Form – Removal of Transitive Dependencies

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Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, RepNum) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate)

TAL Example Third Normal Form – Removal of Transitive Dependencies

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Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, RepNum) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate)

Functional Dependency Formula Primary Key: (CustomerNum) Foreign Key: (RepNum) F(CustomerNum) CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, RepNum) Primary Key: (RepNum) F(RepNum) LastName, FirstName, Street, City, State, PostalCode, Commission, Rate)

TAL Example Third Normal Form – Removal of Transitive Dependencies

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Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, RepNum) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate)

What does the data table look like?

3NF

3NF