附录：
实验7 数据库安全性
基本权限表
1、角色R1 对象 Student SC Course 2、角色R2 对象 Student SC Course 3、用户U1 对象 Student SC Course 4、用户U2 对象 Student SC Course 5、用户U3 对象 Student SC Course SELECT √ INSERT √ UPDATE DELETE SELECT √ INSERT √ UPDATE DELETE SELECT √ √ INSERT √ UPDATE √ DELETE SELECT √ INSERT √ UPDATE DELETE SELECT INSERT √ UPDATE √ DELETE
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