单项选择题
A.An error will occur.
B.Data passed between the client and the server is encrypted.
C.User IDs and passwords are passed to the server unencrypted.
D.User IDs and passwords are encrypted before they are passed to the server.
单项选择题 Which of the following statements allows BOB to revoke access to the SAMPLE database from user TOM?（）
单项选择题 Which of the following statements is used to revoke all DML privileges on table EMPLOYEE from user TOM?（）
单项选择题 Which of the following privileges permits a user to update the comment on a sequence?（）