A.DBWn
B.LGWR
C.SMON
D.PMON
E.RECO
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A.1
B.2
C.3
D.4
E.由初始参数指定
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;
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;
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';
A.select * from emp where comm='';
B.select * from emp where comm=null;
C.select * from emp where nvl(comm)=0;
D.select * from emp where comm is null;
E.select * from emp where nvl(comm,0)=0;
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
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