Which of the following statements allows BOB to revoke access to the SAMPLE database from user TOM?()
A. REVOKE ACCESS ON DATABASE FROM USER bob
B. REVOKE CONNECT ON DATABASE FROM USER tom
C. REVOKE tom FROM ACCESS ON DATABASE BY USER bob
D. REVOKE tom FROM CONNECT ON DATABASE BY USER bo
查看答案
应用程序能像删除文件一样直接删除。
A. 正确
B. 错误
解码片按解码权限分为()个层级使用。
A. 1
B. 2
C. 3
D. 4