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Conjunctive query

In database theory, a conjunctive query is a restricted form of first-order queries using the logical conjunction operator. Many first-order queries can be written as conjunctive queries. In particular, a large part of queries issued on relational databases can be expressed in this way. Conjunctive queries also have a number of desirable theoretical…

Art, Complexity & Formal properties

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Overview

Definition

Fragments

Relationship to other query languages

Datalog

Extensions

Complexity

Formal properties

Advanced semantic analysis

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Map overview Semantic statistics

Conjunctive query

Nodes56
Edges55
Triples15
Avg. degree1.96
Density0.035714
Components1

How this topic connects Entity context

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Conjunctive query

Top relations

related to Complexity · 10
Conjunctive query → AC0, Conjunctive, For, However, LOGSPACE, NP-complete, PSPACE-complete, SQL, The, The NP-hardness
related to Relationship to other query languages · 4
Conjunctive query → Conjunctive, For, Notably, SQL
is a · 1
Conjunctive query → restricted form of first-order queries using the logical conjunction operator

Important terminology Word statistics

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Important terminology

conjunctive queries query relational database complexity problem algebra first-order also equivalent displaystyle combined containment datalog acyclic variables sql thus distinguished

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Conjunctive queryis arestricted form of first-order queries using the logical conjunction operator0.90text
Conjunctive queryrelated to ComplexityFor0.60section
Conjunctive queryrelated to ComplexityThe0.60section
Conjunctive queryrelated to ComplexityConjunctive0.60section
Conjunctive queryrelated to ComplexityNP-complete0.60section
Conjunctive queryrelated to ComplexityAC00.60section
Conjunctive queryrelated to ComplexityLOGSPACE0.60section
Conjunctive queryrelated to ComplexityThe NP-hardness0.60section
Conjunctive queryrelated to ComplexitySQL0.60section
Conjunctive queryrelated to ComplexityPSPACE-complete0.60section
Conjunctive queryrelated to ComplexityHowever0.60section
Conjunctive queryrelated to Relationship to other query languagesConjunctive0.60section

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