January 2008
Intermediate to advanced
384 pages
8h 1m
English
Content preview from Joe Celko's Thinking in Sets: Auxiliary, Temporal, and Virtual Tables in SQL
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6.1. Mullins VIEW Usage Rules
Craig Mullins gave the following rule to ensure that VIEWs are created in a responsible and useful manner. Simply stated, the VIEW creation strategy should be goal-oriented, VIEWs should be created only when they achieve a specific, reasonable goal. Each VIEW should have a specific application or business requirement that it fulfills before it is created. That requirement should be documented somewhere, preferably in a data dictionary.
Although this rule seems obvious, VIEWs are implemented at some shops without much thought as to how they will be used. This can cause the number of VIEWs that must be supported and maintained to continually expand until so many VIEWs exist that it is impossible to categorize their ...
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