Figure 1: The components of a relation (table).
Figure 2: Relationships between relations (tables). The Layer attribute in the FINDS table acts as a foreign key to the LAYERS table.
Figure 3: A simple Entity-Relationship (ER) diagram representing part of the design for an excavation database.
Figure 4: A relational database implementation of the ER diagram in Figure 3. Primary keys are shown underlined, foreign keys in italic.
Figure 5: A simple UML class diagram illustrating inheritance.
Figure 6: Outline architecture of a 3-tier Web-based data access system.
Figure 7: Outline architecture of the ADS Historic Environment Portal.
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Last updated: Wed 28 Jan 2004