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;
相关考题
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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'; -
单项选择题
查询出EMP表中COMM字段为空的记录（）
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;
