Browsing by Author "Παυλάκη, Βάσια"

Now showing items 1-4 of 4

    • Designing views to efficiently answer real SQL queries 

      Γεργατσούλης, Μανώλης; Αφράτη, Φώτο; Παυλάκη, Βάσια; Chirkova, Rada; Gergatsoulis, Manolis; Afrati, Foto; Pavlaki, Vassia (2005)
      The problem of optimizing queries in the presence of materialized views and the related view-design problem have recently attracted a lot of attention. Significant research results have been reported, and materialized views ...

    • Finding equivalent rewritings in the presence of arithmetic comparisons 

      Γεργατσούλης, Μανώλης; Αφράτη, Φώτο; Παυλάκη, Βάσια; Chirkova, Rada; Afrati, Foto; Pavlaki, Vassia; Gergatsoulis, Manolis (2006)
      The problem of rewriting queries using views has received significant attention because of its applications in a wide variety of data-management problems. For select-project-join SQL (a.k.a. conjunctive) queries and views, ...

    • On rewriting Xpath Queries Using Views 

      Γεργατσούλης, Μανώλης; Αφράτη, Φώτο; Παυλάκη, Βάσια; Chirkova, Rada; Kimelfeld, B.; Sagiv, Y.; Gergatsoulis, Manolis; Afrati, Foto; Pavlaki, Vassia (2009)
      The problem of rewriting a query using a materialized view is studied for a well known fragment of XPath that includes the following three constructs: wildcards, descendant edges and branches. In earlier work, determining ...

    • View selection for real conjunctive queries 

      Αφράτη, Φώτο; Γεργατσούλης, Μανώλης; Παυλάκη, Βάσια; Chirkova, Rada; Afrati, Foto; Gergatsoulis, Manolis; Pavlaki, Vassia (2007)
      Given a query workload, a database and a set of constraints, the view-selection problem is to select views to materialize so that the constraints are satisfied and the views can be used to compute the queries in the workload ...