多项选择题

Which Scheduler view(s) can be queried to see which jobs are currently executing? （）

A. DBA_SCHEDULER_JOB_RUN_DETAILS
B. DBA_SCHEDULER_RUNNING_JOBS DBA
C. DBA_SCHEDULER_CURRENT_JOBS
D. DBA_SCHEDULER_JOBS DBA
E. DBA_SCHEDULER_EXECUTING_JOBS

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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

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

Which two statements are true regarding the USING clause in table joins?（）

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