A basic issue in computer science is the complexity of problems.
Computational complexity measures how much time or memory is needed
as a function of the input problem size. Descriptive complexity is
concerned with problems which may be described in first-order
logic. By virtue of the close relationship between logic and
relational databses, it turns out that this subject has important
applications to databases such as analysing the queries computable
in polynomial time, analysing the parallel time needed to compute a
query, and the analysis of nondeterministic classes. This book is
written as a graduate text and so aims to provide a reasonably
self-contained introduction to this subject. The author has
provided numerous examples and exercises to further illustrate the
ideas presented.
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