A.DBWn B.LGWR C.SMON D.PMON E.ARCn
单项选择题如果一个进程意外终止,ORACLE使用下列哪一个后台进程来释放它所占用的资源()
A.DBWn B.LGWR C.SMON D.PMON E.RECO
单项选择题数据库必须拥有至少几个控制文件()
A.1 B.2 C.3 D.4 E.由初始参数指定
单项选择题显示本月月末的日期()
A.select last_date(sysdate) from dual; B.select finally_day(sysdate) from dual; C.select last_day(sysdate) from dual; D.select tail_day(sysdate) from dual;
单项选择题如何显示今天是星期几(周一到周日,分别用1~7表示)()
A.select to_char(sysdate,'D') from dual; B.select to_char(sysdate,'W') from dual; C.select to_char(sysdate,'D')-1 from dual; D.select to_char(sysdate-1,'D') from dual; E.select to_char(sysdate-1,'W') from dual;
单项选择题查询出EMP表中1982年及以后入职的员工信息()(注:字段hiredate为入职日期,数据类型为DATE型)
A.select * from emp where hiredate>='19820101'; B.select * from emp where hiredate>=to_char('19820101','YYYYMMDD'); C.select * from emp where to_date(hiredate,'YYYYMMDD')>='19820101'; D.select * from emp where to_char(hiredate,'YYYYMMDD')>='19820101';