project join meaning in English
投影连接
Examples
- The modification in ldb will cause the global view to be changed , so we have to do view maintenance in multidatabase with materialized views when the ldb changes . most of the existing view maintenance algorithms only consider the views defined by select project join ( spj ) queries
底层关系的修改会导致全局视图的改变，因此，在保存物理视图的多库系统中，当底层关系发生变化时，要对全局视图进行视图维护，使其与底层关系保持一致，这就是多库系统中的全局视图维护问题。