Equivalence of conjunctive queries

  • How do you equivalent the query in DBMS?

    Query equivalence in a Database Management System (DBMS) refers to the concept that two different database queries, when executed against a given database, produce the same result set.
    The query equivalence means that two queries, while potentially expressed differently, retrieve the same data from the database..

  • What is an equivalent query?

    Query equivalence in a Database Management System (DBMS) refers to the concept that two different database queries, when executed against a given database, produce the same result set.
    The query equivalence means that two queries, while potentially expressed differently, retrieve the same data from the database..

  • What is conjunctive query in relational algebra?

    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 where all variables are distinguished (and no variables are bound) are called equi-join queries, because they are the equivalent, in the  DefinitionRelationship to other query DatalogComplexity

Categories

Evaluation of conjunctive queries
Theory of conjunctive queries
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