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Chapter 1: DBMS Languages ï® DDL: can be used to define conceptual and internal schema in DBMS, where there is no strict separation ï® DDL is used to specify conceptual and SDL to specify internal where there is separation ï® VDL: is used to specify user views and their mapping to conceptual ï® VDL statements can be compiled separately or can be imbedded in a programming language May 22, 2017 Data Base Organization and File Structure: Introduction 28
