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CONCEPTUAL LEVEL DATA BASE DESIGN
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abstract data types abstract objects aggregation analysis aspects attributes base management system Bubenko classification CODASYL concept classes conceptual data structure conceptual level data conceptual organization conceptual schema concerned correspond data base design data base management data base system data elements defined described description of users design approach design methods discussed e-message employee enterprise entity diagram entitysets example expressed in terms formal frame of reference functional dependencies global user view hierarchy identified inference relationships information requirements information structure design information systems design instance level data integrity constraints level data base level data structure level of data logical data base method approach names nodes non-redundancy occurrence output phenomena model problem areas process structure properties proposed Raver real world phenomena redundancy referenced regarded Relational Data Model relevant representation represented Semantic Network semantical integrity specification step tasks Third Normal Form type level data types of statements units of information values