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This book is in three parts. The first part describes the§database management system as it should be and discusses the§various facilities it should offer the database administra-§tor, the programmer and the general user. The second part§describes SQL, including the schema and sub-schema defini-§tion languages, the module language, the module language and§themanipulation language while a third part is devoted to§NDL including the commands to create the schema and the§views, the module and the data manipulation language.