Download Database System Concepts and Architecture

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Transcript
DBMS Languages
• Data Definition Language DDL: Language to specify
conceptual and internal schemas for the database and any
mappings between the two.
• Storage definition language SDL: used when clear
distinction between conceptual and internal schema.
• view definition language VDL: specify user views and
their mappings to the conceptual schema.
• data manipulation language DML:retrieval, insertion,
deletion, and modification of the data
Jan 29, 2002