The design of data languages-data man- ipulate language(DML) and data dibinition language(DDL) in MQBE, the architecture of MQBE, and the data structures used to implement the architecture, especially the B~+- tree structure, are introduced.

• 数据处理语言(DML)和数据定义语言(DDL)作了介绍。 说明了MQBE的系统结构,以及为了实现此结构所采用的数据结构,尤其是B~+树结构和特点。