As virtual database uses relational data model, the paper makes a special effort to discuss query rewriting technology-rewriting queries using views and its conjunctive query, containment mapping under this model. 基于虚拟数据库所采用的关系数据模型,着重探讨了该模型下的查询重写技术&利用视图重写查询以及基于其上的合取查询、包含映射等问题。