单项选择题
Which statement is true regarding synonyms?（）
A.Synonyms can be created only for a table
B.Synonyms are used to reference only those tables that are owned by another user
C.A public synonym and a private synonym can exist with the same name for the same table
D.The DROP SYNONYM statement removes the synonym, and the table on which the synonym has been created becomes invalid
相关考题
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单项选择题
Which of the following is not a valid calendaring syntax element?（）
A. FREQ
B. BYHOUR
C. RUNDATE
D. INTERVAL
E. BYMINUTE -
多项选择题
WhichtwostatementsaretrueregardingtheUSINGclauseintablejoins?（）
A.It can be used to join a maximum of three tables
B.It can be used to restrict the number of columns used in a NATURAL join
C.It can be used to access data from tables through equijoins as well as nonequijoins
D.It can be used to join tables that have columns with the same name and compatible data types -
多项选择题
Which DBMS_SCHEDULER procedures can be used to enable a program?（）
A. ENABLE启用
B. ENABLE_PROGRAM
C. VALIDATE_PROGRAM
D. SET_ATTRIBUTE设置属性
E. SET_ENABLED
