Basic HTML version of Foils prepared 4 Feb 98

Foil 10 Database Design - III

From Overview of Microsoft Access used with Active Server Pages(ASP) CPS616 Technologies of Information Age -- Spring 1998. by Nancy McCracken and Sangetta Aggarwal
Many-to-Many - For each row in the first table, there can be many rows in the second table, and for each row in the second table, there can be many rows in the first table.
The relational model specifies two Integrity rules:
  • Entity integrity rule - Primary keys cannot contain null (missing) data.
  • Referential integrity rule - The database must not contain any unmatched foreign key values.

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