多项选择题
Which DBMS_SCHEDULER procedure(s) can be used to alter an existing job? （）
A. SET_ATTRIBUTE_NULL B. ALTER_JOB C. ALTER_JOB_PARAMETERS D. ALTER E. SET_ATTRIBUTE
多项选择题 Which Scheduler view(s) can be queried to see which jobs are currently executing? （）
单项选择题 Whichstatementistrueregardingsynonyms?（）
单项选择题 Which of the following is not a valid calendaring syntax element?（）
