Evaluation of conjunctive queries

  • What is the significance of query in a DBMS?

    Queries help you find and work with your data
    A query can either be a request for data results from your database or for action on the data, or for both.
    A query can give you an answer to a simple question, perform calculations, combine data from different tables, add, change, or delete data from a database..

It is easy to see that conjunctive (and, more general, first-oder) queries can always be evaluated in time ||A||O(||ϕ||), where ||A|| denotes the size of the input structure A and ||ϕ|| the length of the formula ϕ. Thus conjunctive query evaluation is possible in time polynomial in the structure size.
It is easy to see that conjunctive (and, more general, first-oder) queries can always be evaluated in time ||A||O(||ϕ||), where ||A|| denotes the size of the input structure A and ||ϕ|| the length of the formula ϕ. Thus conjunctive query evaluation is possible in time polynomial in the structure size.
It is easy to see that conjunctive (and, more general, first-oder) queries can always be evaluated in time ||A||O(||ϕ||), where ||A|| denotes the size of the input structure A and ||ϕ|| the length of the formula ϕ. Thus conjunctive query evaluation is possible in time polynomial in the structure size.

Categories

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