资料来源 : Free On-Line Dictionary of Computing

Data definition language
     
         (DDL)
     
        1. A language enabling the structure and instances of a
        {database} to be defined in a human-, and machine-readable
        form.
     
        {SQL} contains DDL commands that can be used either
        interactively, or within programming language {source code},
        to define databases and their components, e.g. CREATE and
        DROP.
     
        See also {Data manipulation language} (DML).
     
        2. A specification language for databases, based on the
        {entity-relationship model}.  It is used in the {Eli}
        {compiler-compiler} to manage type definitions.
     
        ["DDL Reference Manual", ECE Dept U Colorado, 1991].
     
        (1999-04-26)