Schema Structure

Schema Structure -:-  Schema structure of the data base is called schema on the base of                                                            three level architecture,
                                                        schema's can be categriesd   into three categries------

(1) Internal Schema -:-  The structure defind the physical level is called Internal Schema .

(2) Logical Schema -:-  The structure defind as logical or conceptual level is called logical schema .

(3) External Schema -:- Structure defind as view level forms the external schema .