單項選擇題

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 bob

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單項選擇題

Which of the following statements is used to revoke all DML privileges on table EMPLOYEE from user TOM?（）

A.REVOKE ALL PRIVILEGES FROM USER tom
B.REVOKE ALL ON EMPLOYEE FROM USER tom
C.REVOKE EXECUTE ON EMPLOYEE FROM USER tom
D.REVOKE PRIVILEGES ON EMPLOYEE FROM USER tom

單項選擇題

Which of the following privileges permits a user to update the comment on a sequence?（）

A.CONTROL
B.UPDATE
C.USAGE
D.ALTER