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Normalization

A process in which you eliminate redundancy and maintain data integrity.

Starting point (no normalization)

SalesStaff
EmployeeID
SalesPerson
SalesOffice
Age
DOB
Customer1
Customer2
Customer3

1st NF (Atomic values, No repeating Columns)

SalesStaff
EmployeeID
SalesPersonName
Age
DOB
SalesOfficeStreet
SalesOfficeCity
SalesOfficeState
SalesOfficeZip
Customer
CustomerId
EmployeeId
CustomerName

2nd NF (Remove Partial Dependencies)

SalesStaff
EmployeeID
SalesPersonName
Age
DOB
SalesOfficeID
SalesOffice
SalesOfficeId
SalesOfficeStreet
SalesOfficeCity
SalesOfficeState
SalesOfficeZip
Customer
CustomerId
EmployeeId
CustomerName

3rd NF (Remove Transitive Dependencies)

SalesStaff
EmployeeID
SalesPersonName
DOB
SalesOfficeID
SalesOffice
SalesOfficeId
SalesOfficeStreet
SalesOfficeZip
Customer
CustomerId
EmployeeId
CustomerName