Titlebook: Deductive and Object-Oriented Databases; Third International Stefano Ceri,Katsumi Tanaka,Shalom Tsur Conference proceedings 1993 Springer-

排斥

Negation and aggregates in recursive rules: the ,++ approach,rent research in deductive databases. In this paper, we present a solution that combines generality with efficiency, as demonstrated by its implementation in the new .++ system. A novel and general treatment of set aggregates, allowing for user-defined aggregates, is also presented.

不自然

嚙齒動(dòng)物

inchoate

成績(jī)上升

An extension of path expressions to simplify navigation in object-oriented queries, that this does not fully exploit their potential expressive power as a tool to specify connections between objects. In particular, a user should not be required to specify a path to be followed in full, but rather should provide enough information so that the system can infer missing details automa

確定無(wú)疑

Query classes,he query language in such a data model has to reflect the amalgamation because it works as the interface to the user and/or application program. This paper proposes a language to formulate queries as classes related to the schema classes and constrained by an associative membership condition. Answer

Jacket

cumulative

Opponent

https://doi.org/10.1007/978-3-658-33707-0antically-rich query that is more efficiently processed. We also discuss the issues of conflict resolution strategies and query evaluation priorities for queries involving the upper bounds of objects in the F-logic “type” lattice.

Detonate