The joint query is the mainly query in the relation database. This article showed the order of the joint query on multi-tables through the example.
联接查询是关系数据库中最主要的查询，本文通过实例说明关系数据库中进行多表联接查询时联接的顺序性。
In makes an applied multi-level relation model to be basement of security database for following the BLP model.
为了适应BLP 模型，采用一种实用的多级 关系 模型作为安全数据库的基础，这是原有 关系 模型的扩展。
应用推荐