摘要
在使用关系数据库时,用户需要的数据经常散步在多个表中,可以使用相关子查询获得所需数据。说明了相关子查询的一种执行过程。给带蕴涵语义查询功能的实现和执行提供了一些参考。
The data we needed is always scattered in several tables when using relational database and we had better access to data with correlated sub-query. It needs repeated the execution between inner query and outer query. A kind of process is stated in the essay for correlated sub-query and a consultation is provided.
出处
《唐山师范学院学报》
2009年第2期105-106,共2页
Journal of Tangshan Normal University
关键词
相关子查询
实现
执行
correlated sub-query
implementation
execution
