关系数据库中传统集合运算的实现

The Realization of the Traditional Gathers inside the Relation Database

关系数据库中传统的集合运算并、差、交没有对应的专用命令,只能通过系列操作或程序来实 现,实现这种运算的思想和方法对解决实际问题有着重要的指导意义。

There are no related orderany of the traditional calculation on and, differ,handover in the related dataase.So that we should only realize that all above by means of series operation or procedure. To realize this land of calculating thought and measures has very important significance to solve the actural problems.