ppt Introduction to Database Systems "online courseware." An Introduction to Database Systems "is calculated Computer Science and technology professionals are basic course, the main discussion database system of basic concepts, basic tenets, and basic methods and related applications.

第3章-关系模型(关系结构、约束).ppt
第4章-数据库语言SQL(上).ppt
第4章-数据库语言SQL(下).ppt
第4章-数据库语言SQL(中).ppt

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