In broad themes, database management systems (DBMSs) have historically been of three types: hierarchical, relational, and object-oriented.
从广义角度来说，数据库管理系统(DBMS)在历史上划分成三种类型：层次、关系和面向对象。
In broad themes, database management systems (DBMSs) have historically been of three types: hierarchical, relational, and object-oriented.
从广义角度来说，数据库管理系统(DBMS)在历史上划分成三种类型：层次、关系和面向对象。
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