9 - Advanced Access - BIT 200 Personal Productivity Session...

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Session 9 Advanced Access BIT 200 Personal Productivity
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Agenda § What’s in the News § Wiki Report Cyberwar § Reflection on Last Week § Converting ER Diagrams to Databases § Queries, Forms, and Reports § Queries in General § Reports in General
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Upcoming § Deliverable 10a, Access Tutorial 3 § Deliverable 10b, Access Tutorial 4 Both due Monday, December 5 at 11:55 PM § Next Week: Networks Read the Wikipedia article on the Internet <en.wikipedia.org/wiki/Internet>
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What’s In the News? 4
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Wiki/Tech Topics Project § Cyberwar
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Reflection on Last Week § Database Design
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Database Design § Using data structures that are not normalized may result in problems when maintaining the data § Third normal form avoids these problems “Every field depends on the key, the whole key, and nothing but the key” § An entity-relationship diagram is a graphical tool that depicts the content of a database and the relationships among the pieces
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Entity-Relationship (ER) Diagram Own N M Customer Stock A stock may be owned by many customers A customer may own many stocks Entity Relationship Entity Many-to-many relationship
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Establishing Relationships and Referential Integrity 9
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Establishing Relationships 10
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11 Establishing Relationships
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Referential Integrity 12
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Referential Integrity § A set of rules that Access enforces to maintain consistency between related tables 1. Can’t add a record to a related table unless a matching record exists in the primary table Example: can’t add a contract for a customer unless the customer already exists 2. Can’t change the value of the primary key in a table if matching records exist in a related table Example: can’t change a customer number if there are contracts recorded for that customer 3.
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