Data Definition Language (DDL)
Data Definition Language (DDL)
- Used to specify a database scheme as a set of definitions expressed in a DDL
- DDL statements are compiled, resulting in a set of tables stored in a special file called a data dictionary or data directory.
- The data directory contains metadata (data about data)
- The storage structure and access methods used by the database system are specified by a set of definitions in a special type of DDL called a data storage and definition language
- basic idea: hide implementation details of the database schemes from the users
January 28th, 2007
Posted by aliaswn
in
Technology |
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