一组以数据解释语言来表达的语句集，该语句集完整地描述了数据库的结构。
The set of statements, expressed in data definition language, that completely describe the structure of a data base.
一组以数据定义语言来表达的语句集，该语句集完整地描述了数据库的结构。
The set of statements, expressed in data definition language, that completely describe the structure of a data base.
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