Normalization

Database Normalization ,[object Object],[object Object],[object Object],Racoosin Solutions rSolutions@erols.com 703 849-1997

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Introductions ,[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Why Normalize? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Normalization Defined ,[object Object],[object Object],[object Object],Racoosin Solutions

Another Definition ,[object Object],Racoosin Solutions

The Normal Forms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

First Normal Form (1NF) ,[object Object],[object Object],Solution: make a separate table for each set of attributes with a primary key (parser, append query) Customers CustomerID Name Orders OrderID Item CustomerID OrderDate Racoosin Solutions

Second Normal Form (2NF) ,[object Object],[object Object],Solution: Remove to a separate table (Make Table) OrderDetails OrderID Item Orders OrderID CustomerID OrderDate Racoosin Solutions

Third Normal Form (3NF) ,[object Object],[object Object],[object Object],OrderDetails OrderID Item Quantity Price Put expression in text control or in query: =Quantity * Price Racoosin Solutions

Boyce-Codd Form (3NF) - Examples ,[object Object],[object Object],[object Object],2/16/98 10 MGS 404 2/16/98 10 Kumar Madurai: http://www.mgt.buffalo.edu/courses/mgs/404/mfc/lecture4.ppt

Primary Key ,[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Relationships ,[object Object],Two “foreign” keys make a composite primary key and “relate” many to many tables A look up table - it doesn’t reference any others Racoosin Solutions

Table Prefixes Aid Development ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],tblOrders OrderID CustomerID OrderDate OrderDetails OrderID Item trelOrderItem OrderID ItemID tlkpItems ItemID ItemName Racoosin Solutions

Referential Integrity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

When Not to Normalize ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Real World - School Data Student Student Previous Current Last First Parent 1 Parent 2 Teacher Teacher Smith Renee Ann Jones Theodore Smith Hamil Burke Mills Lucy Barbara Mills Steve Mills Hamil Burke Jones Brendan Jennifer Jones Stephen Jones Hamil Burke …. Street Address City State Postal Code Home Phone 5551 Private Hill Annandale Virginia 22003- (703) 323-0893 4902 Acme Ct Annandale Virginia 22003- (703) 764-5829 5304 Gains Street Fairfax Virginia 22032- (703) 978-1083 …. First Year Last Year Age Program Enrolled Attended Birthday inSept Map Coord Notes PF / 0 0 6/25/93 5 22 A-3 PF 96/97 0 8/14/93 5 21 F-3 PH 96/97 0 6/13/94 4 21 A-4 Racoosin Solutions

One Possible Design Racoosin Solutions

Books ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Internet ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Racoosin Solutions

Normalization

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