conjunctive query

基本解釋

When the constraint expression of a query is not a CNF (Conjunctive Normal Form), it is generally transformed into an equivalent DNF (disjunctive normal form)an union of CNFs .
當(dāng)數(shù)據(jù)立方查詢條件不是合取范式時(shí)，一般是將它轉(zhuǎn)化成為若干合取范式的并的形式（析取范式）。

合取查詢
The thesis achieves next results:Firstly, this paper introduces the Description Logic ALCR_+, the epistemic description logic ALCK and the conjunctive query in the Description Logic.
本文的工作主要圍繞以下幾個(gè)方面展開:論文首先介紹了描述邏輯ALCR_+,認(rèn)知描述邏輯ALCK以及在描述邏輯中的合取查詢。
連接查詢
Since the algorithm has been presented the bucket enhanced, it can generate only sound solutions and also eliminate the need for an exponential conjunctive query containment tests.
改進(jìn)后的算法為公共變量創(chuàng)建了增強(qiáng)的木桶,確保了只生成有效的候選解決方案,因此消除了原先必要的指數(shù)級(jí)的連接查詢包含測(cè)試。
關(guān)聯(lián)查詢