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action diagram application development application programs arrow associated attributes automatically bubble chart candidate keys canonical Chapter COBOL CODASYL complex concatenated key contains corporation create CUSTOMER data administrator data dictionary data items data model data processing data structures data-base designer data-base environment data-base management system data-base systems DBMS DP EXECUTIVE employ EMPLOYEE ENC YES YES end users end-user entity example existing Figure files fourth normal form fourth-generation languages functionally dependent identify IDMS implemented Information Center information systems input view installations logical ment multiple NAME on-line operations ORDER organization physical planning primary key problems procedures record redundant relational SALARY SCE ENC YES schema second normal form secondary key separate sometimes subject data bases SUPPLIER systems analysts techniques terminal third normal form tion top management transactions update usage user views vendor YES YES YES