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By itself, a database is nothing more than a container that holds data. The functions and tools are what make a database truly useful. Much of the work of designing an effective database is being able to model the business rules needed. Developing the proper table schema is one of the ways to model the business rules within the database; the other ways are through the creation of custom functions, triggers, and rules. As a basic overview, functions, triggers, and rules compare as follows :
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