Databases in Theory and Practice
Databases: In Theory and Practice adopts a pragmatic, technical approach to the subject of database systems. In this book the authors set about dealing with the underlying theory of databases in an accessible, non-mathematical manner. Covering all aspects of the subject, the book introduces the concepts from a problem-solving point of view with numerous practical examples and problems.
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ACCESS-CONTROL LOCK ACCNO account number ACCTYPE allow application program approach attributes BALANCE branch code candidate key Chapter checkpoint COBOL CODASYL conceptual model created cursor CUSTINV CUSTNO CUSTNUM customer name customer number data analysis data items database design database management systems database systems DBMS defined definition deleted disc dump efficiency entity error example existing functions identifier implemented inheritance instance insurance company investment account investment record journal file language logical data logical data model logical model mortgage Note object-oriented data model occur OODB OODBMS operating system option owner physical PL/SQL pointers possible primary key problems query recovery relational algebra relational databases relationship reload restructure result retrieval rollback schema second normal form Section SELECT sequential shown in Figure single statement storage stored submodel subschema SURNAME third normal form transaction tuple update