Anguish
发表于 2025-3-25 05:03:12
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航海太平洋
发表于 2025-3-25 09:26:35
Diagnostic of Urogenital Tuberculosis,e algebra and the calculus carries over easily. Furthermore, all the algebraic operations described in in Section 2.4.4 can be effectively evaluated over constraint databases, and that the data complexity bounds discussed in Chapter 4 also apply to the algebra.
EXPEL
发表于 2025-3-25 13:54:38
Introductionconjunction of constraints from an appropriate language (for example, linear arithmetic constraints), and that many of the features of the relational model could be extended in an appropriate way. In particular, standard query languages such as those based on first-order logic and . could be extended, at least in principle, to such a model.
badinage
发表于 2025-3-25 17:15:46
Expressive Power: The Finite Casebases whose elements come from the set .. For example, FO + . and FO + ., the relational calculus with linear and polynomial constraints, can be considered as query languages over ordinary relational databases that store numbers.
Wordlist
发表于 2025-3-25 20:48:50
Selection of a Surgical Strategy some generality. We shall see that equivalence of relational calculus queries on constraint databases is typically undecidable, but that that equivalence is decidable in the special case of conjunctive queries on constraint databases.
Biofeedback
发表于 2025-3-26 02:32:42
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Thyroid-Gland
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BLA
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Vulnerable
发表于 2025-3-26 12:58:08
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negligence
发表于 2025-3-26 17:31:32
s. In par ticular, the terminology and the style of presentation have been standardized, and there are multiple cross-references between the chapters. The idea of constraint databases goes back to the late Paris Kanellakis.978-3-642-08542-0978-3-662-04031-7