以下语句不正确的是( )
A: select * from emp;
B: select ename,hiredate,sal from emp;
C: select * from emp order deptno;
D: select * from where deptno=1
A: select * from emp;
B: select ename,hiredate,sal from emp;
C: select * from emp order deptno;
D: select * from where deptno=1
举一反三
- 以下语句不正确的是( ) A: select * from emp B: select ename,hiredate,sal from emp C: select * from emp order deptno D: select * from where deptno=1 and sal<300
- 统计每个部门中人数的语句是？ A: select count(id) from emp order by deptno; B: select sum(id) from emp order by deptno; C: select count(id) from emp group by deptno; D: select sum(id) from emp group by deptno;
- 以下语句正确的是() A: select<br/>sal+1 from emp; B: select<br/>sal*10,sal*deptno from emp; C: 不能使用运算符号 D: select<br/>sal*10,deptno*10 from emp;
- 查询部门20的员工数量,每个月的工资总和及平均工资( ) A: SELECT sum(nvl(sal,0)),avg(nvl(sal,0)) from emp B: SELECT ename,sum(nvl(sal,0)),avg(nvl(sal,0)) from emp where deptno =20 group by deptno C: SELECT ename,count(empno),sum(nvl(sal,0)),avg(nvl(sal,0)) from emp where deptno =20 group by deptno D: SELECT count(empno),sum(nvl(sal,0)),avg(nvl(sal,0)) from emp where deptno =20 group by deptno
- 以下哪个查询操作能够实现将员工的参加工作日期按如下格式显示：月份/年份。 A: select ename,hiredate,to_char(hiredate,'HH/RR') from emp; B: select ename,hiredate,to_char(hiredate,'MM/RR') from emp; C: select ename,hiredate,to_char(hiredate,'MON') from emp; D: select ename,hiredate,to_char(hiredate,'DD/YY') from emp;