GALL
发表于 2025-3-21 17:42:13
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刺激
发表于 2025-3-21 23:54:43
Constraint Databases, Queries, and Query Languagesnal calculus, the relational algebra, and .. We show how a computationally complete constraint query language can be obtained by augmenting the constraint relational calculus with basic programming language features. We look into some basic model-theoretic issues concerning the constraint relational
tolerance
发表于 2025-3-22 01:48:18
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vitrectomy
发表于 2025-3-22 07:00:16
Query Safety with Constraintsts expressible through queries in the relational calculus, for example, is limited in a number of ways: They have PTIME data complexity, and their expressiveness is well understood. Although relational calculus queries may not return finite results, a natural subclass of the relational calculus does
聚集
发表于 2025-3-22 10:28:20
Aggregate Languages for Constraint Databasesry languages give a natural analog of relational calculus in the geometric context, a crucial question concerns how to extend standard aggregation constructs from the relational model to the geometric setting. This question has two components.
咒语
发表于 2025-3-22 15:32:28
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咒语
发表于 2025-3-22 21:04:20
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Radiculopathy
发表于 2025-3-22 23:27:32
Euclidean Query Languagesssive power of language FO + . is too limited. One of these limitations is that FO + . is incapable of expressing queries involving Euclidean distance, betweenness, and collinearity. For example, a query such as “Return all cities in Belgium that are further than 100 km away from Brussels” cannot be
无表情
发表于 2025-3-23 05:01:28
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戏法
发表于 2025-3-23 07:25:03
Linear Repeating Pointstime can easily be introduced as additional attributes in the relational model. Of course, specific operations need to be performed with temporal attributes, such as dealing with date formats, but such operations are not really problematic, and have long been available in commercial systems. Neverth