customer order order number date cust id last name first name state amount tax rate product 1 id...
TRANSCRIPT
Customer OrderOrder NumberDateCust IDLast NameFirst NameState Amount Tax RateProduct 1 IDProduct 1 DescriptionProduct 1 QuantityProduct 2 ID Product 2 DescriptionProduct 2 QuantityProduct 3 IDProduct 3 DescriptionProduct 3 Quantity
Single Table, Not Normalized
Three Problems to Address;
(for 1st, 2nd, and 3rd Normal Form)
•Repeating Groups
- Such as Product ID, Product Description
•Partial Dependencies
- An attribute of an entity identified by only part of the concatenated key
•Transitive Dependencies
- An attribute of an entity identified by another attribute (foreign key)
OrderOrder NumberDateCust IDLast NameFirst NameState Amount Tax Rate
Product OrderOrder NumberProduct IDProduct DescriptionProduct Quantity
First Normal Form: no repeating groups
OrderOrder NumberDateCust IDLast NameFirst NameState Amount Tax Rate
Product OrderOrder NumberProduct IDProduct Quantity
Second Normal Form: No partial dependencies
ProductProduct IDProduct Description
OrderCust IDOrder NumberDateState Amount
Product OrderOrder NumberProduct IDProduct Quantity
ProductProduct IDProduct Description
Third Normal Form: No transitive dependencies
CustomerCust IDLast NameFirst Name
StateStateTax Rate