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Access_Essentials - Access Essentials PH 647A Janet Wolf...

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Access Essentials PH 647A Janet Wolf, MPH Spring 2009
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2 Database Concepts A database is a collection of data arranged according to a fixed structure The structure makes the information easy to input, select, sort, display, and print in a variety of formats Access is a database management program – a program that enables you to maintain a database easily
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3 Relational Databases Allow for defining relationships between information contained in multiple tables A relationship is a link between 2 tables Permit extensive information manipulation, smaller databases, and fewer data entry errors Access is a relational database application
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4 Planning a Database Probably the most crucial aspect of developing a database And . . . one of the most difficult aspects
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5 Planning a Database You must determine: Purpose of the database What information needs to be stored What the data looks like and how it will be used Tables needed A table should contain only information for one subject/topic (not one case)
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6 Planning a Database Fields needed Each field should relate directly to the subject of the table Break into the smallest parts Keep number of fields to a minimum Primary key Unique ID for each record in a table
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