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constraint modelling and programming

Theory and Practice of Logic Programming (1)

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Combining relational algebra, SQL, constraint modelling, and local search *
MARCO CADOLI, TONI MANCINI
Journal:

Theory and Practice of Logic Programming / Volume 7 / Issue 1-2 / January 2007

Published online by Cambridge University Press:

01 January 2007, pp. 37-65
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The goal of this paper is to provide a strong integration between constraint modelling and relational DBMSs. To this end we propose extensions of standard query languages such as relational algebra and SQL, by adding constraint modelling capabilities to them. In particular, we propose non-deterministic extensions of both languages, which are specially suited for combinatorial problems. Non-determinism is introduced by means of a guessing operator, which declares a set of relations to have an arbitrary extension. This new operator results in languages with higher expressive power, able to express all problems in the complexity class NP. Some syntactical restrictions which make data complexity polynomial are shown. The effectiveness of both extensions is demonstrated by means of several examples. The current implementation, written in Java using local search techniques, is described.

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Combining relational algebra, SQL, constraint modelling, and local search *

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Combining relational algebra, SQL, constraint modelling, and local search*

Combining relational algebra, SQL, constraint modelling, and local search *