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Joe Celko's Trees and Hierarchies in SQL for Smarties, 2nd Edition by Joe Celko

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Chapter 14. State Transition Graphs
Data validation in a database is much more complex than seeing if a string parameter really is an integer. A commercial world is full of complex rules for sequences of procedures, of fixed or variable life spans, warranties, commercial offers, and bids. All this requires considerable subtlety to prevent bad data getting in and, if it does, locating and fixing the problem.
Keywords: data validation, data definition language, state transition diagram, initial state, flow lines, termination states
Data validation in a database is much more complex than seeing if a string parameter really is an integer. A commercial world is full of complex rules for sequences of procedures, of fixed or variable life spans, warranties, ...

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