emp员工表

(empno员工号/ename员工姓名/job工作/mgr上级编号/hiredate受雇日期/sal薪金/comm佣金/deptno部门编号)

------1.选择部门30中的所有员工.

select ename

from emp

where deptno = 30;

------2.列出所有办事员(CLERK)的姓名，编号和部门编号.

select ename,empno,deptno

from emp

where job='CLERK';

------3.找出佣金高于薪金的员工.

select *

from emp

where nvl(comm,0)>sal;

------4.找出佣金高于薪金的60%的员工.

select *

from emp

where nvl(comm,0)>sal*0.6;

------5.找出部门10中所有经理(MANAGER)和部门20中所有办事员(CLERK)的详细资料

select *

from emp

where deptno=10 and job ='manager'

or deptno=20 and job ='CLERK';

------6.找出部门10中所有经理(MANAGER),部门20中所有办事员(CLERK),既不是经理又不是办事员但其薪金大于或等于2000的所有员工的详细资料.

select *

from emp

where deptno=10 and job ='manager'

or deptno=20 and job ='CLERK'

or deptno not in ('manager','CLERK') and sal >=2000;

------7.找出收取佣金的员工的不同工作.

select distinct job

from emp

where comm>0;

------8.找出不收取佣金或收取的佣金低于100的员工.

select *

from emp

where sal between 0 and 100

or sal is null;

------9.找出各月倒数第3天受雇的所有员工.

select *

from emp

where hiredate=last_day(hiredate)-2;

------10.找出早于12年前受雇的员工.

select *

from emp

where hiredate

------11.以首字母大写的方式显示所有员工的姓名.

select initcap(ename)

from emp;

------12.显示正好为5个字符的员工的姓名.

select *

from emp

where ename like '_____';

------13.显示不带有"R"的员工的姓名.

select initcap(ename)

from emp;

where ename not like '%R%';

------14.显示所有员工姓名的前三个字符

select substr(ename,1,3)

from emp

------15.显示所有员工的姓名,用a替换所有"A"

select translate(ename,'A','a')

from emp;

------16.显示满10年服务年限的员工的姓名和受雇日期.

select ename,hiredate

from emp

where hiredate>add_months(sysdate,-12*10);

------17.显示员工的详细资料,按姓名排序.

select *

from emp

order by ename;

------18.显示员工的