Views View Modifications  Introduction.

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Presentation transcript:

Views View Modifications  Introduction

View Modifications: Intro Why use views? Hide some data from some users Make some queries easier / more natural Modularity of database access Real applications tend to use lots and lots (and lots and lots!) of views

View Modifications: Intro Querying views Once V defined, can reference V like any table Queries involving V rewritten to use base tables

View Modifications: Intro Modifying views Once V defined, can we modify V like any table ? Doesn’t make sense: V is not stored Has to make sense: views are some users’ entire “view” of the database Solution: Modifications to V rewritten to modify base tables

View Modifications: Intro Modifications to V rewritten to modify base tables

View Modifications: Intro Modifications to V rewritten to modify base tables (1) Rewriting process specified explicitly by view creator + Can handle all modifications – No guarantee of correctness (or meaningful) (2) Restrict views + modifications so that translation to base table modifications is meaningful and unambiguous + No user intervention – Restrictions are significant