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Data Definition Language

DDLSQL 的子语言,用于定义、删除和修改 关系模型 数据库架构 的语言。


Database System Concepts

We specify a database schema by a set of definitions expressed by a special language called a data-definition language (DDL). The DDL is also used to specify additional properties of the data.[1]


  1. Abraham Silberschatz, Henry F. Korth, and S. Sudarshan, Database System Concepts, Seventh edition (New York, NY: McGraw-Hill, 2020). P13 ↩︎