A.select * from emp wher sal in (2000,3000);
B.select * from emp wher sal like (2000,3000);
C.select * from emp wher sal = (2000,3000);
D.select * from emp wher sal between 2000 and 3000;

A.select * from emp where ename in 'S%';
B.select * from emp where ename='S%';
C.select * from emp where ename like 'S%';
D.select * from emp where ename like 'S_';

A.select to_date(sysdate,'YYYY-MM-DD HH24:MI:SS') from dual;
B.select to_char(sysdate,'YYYY-MM-DD HH24:MI:SS') from dual;
C.select date(sysdate,'YYYY-MM-DD HH24:MI:SS') from dual;
D.select chr(sysdate,'YYYY-MM-DD HH24:MI:SS') from dual;

A.A UNION B
B.A UNION ALL B
C.A INTERSECT B
D.A MIUS B

A.A MIUS B
B.B MINUS A
C.A INTERSECT B
D.B INTERSECT A

A.select job from emp;
B.select job,count(*) from emp;
C.select distinct job,count(*) from emp;
D.select job,count(*) from emp group by job;
E.select job,sum(empno) from emp group by job;

A.Windows NT
B.Windows 2000
C.Windows 98
D.SCO UNIX
E.Redhat Linux

A.事务中的操作是一个整体，要成功都成功，要失败都失败
B.事务可以把所操作的数据库由一个状态转变到另一个状态
C.事务在提交之前，其它事务看不到它对数据库的影响
D.事务提交后，其结果将在数据库中得以体现
E.以上所述都是正确的

A. ALTER TABLE
B. DEFINE TABLE
C. MODIFY TABLE
D. REBUILD TABLE
E. REVISE TABLE

A、delete from a;
B、drop table a;
C、trunc table a;
D、truncate table a;
E、以上所述都不正确

A.DBWn与数据库缓冲区
B.LGWR与重做日志文件
C.CKPT与控制文件
D.ARCn与归档日志文件