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Used by the DBA and database
designers to specify the conceptual schema of a database.
• In many DBMSs, the DDL is also
used to define internal and external schemas
(views).
• In some DBMSs, separate storage
definition language (SDL) and view definition language (VDL) are used to define
internal and external schemas.
• SDL is typically realized via
DBMS commands provided to the DBA and database designers
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