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单选题
You want to purge job entries older than 5 days from the job log. You do not want to purge window log entries. Which command will you use to accomplish this task？（）
A
EXECUTE DBMS_SCHEDULER.PURGE_LOG（log_history => 5， job_name => ’JOB1’）；
B
EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history => 5， job_name => ’JOB_LOG’）；
C
EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history => 5， which_log => ’JOB1’）；
D
EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history => 5， which_log =>’JOB_LOG’）；
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更多 “单选题You want to purge job entries older than 5 days from the job log. You do not want to purge window log entries. Which command will you use to accomplish this task？（）A EXECUTE DBMS_SCHEDULER.PURGE_LOG（log_history = 5， job_name = ’JOB1’）；B EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history = 5， job_name = ’JOB_LOG’）；C EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history = 5， which_log = ’JOB1’）；D EXECUTE DBMS_SCHEDULER.PURGE_LOG（ log_history = 5， which_log =’JOB_LOG’）；” 相关考题
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单选题列出EMP表中，从事每个工种（JOB）的员工人数（）A
select job from emp;B
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