Computational problems related to the design of normal form relational schemas

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Abstract
Problems related to functional dependencies and the algorithmic design of relational schemas are examined. Specifically, the following results are presented: (1) a tree model of derivations of functional dependencies from other functional dependencies; (2) a linear-time algorithm to test if a functional dependency is in the closure of a set of functional dependencies; (3) a quadratic-time implementation of Bernstein's third normal form schema synthesis algorithm. Furthermore, it is shown that most interesting algorithmic questions about Boyce-Codd normal form and keys are NP -complete and are therefore probably not amenable to fast algorithmic solutions.

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