Oracle数据库的常用语句练习

1.选择部门中30的雇员
select * from emp where deptno=30;

2.找出佣金高于薪金的雇员
select * from emp where comm>sal;

3.找出佣金高于薪金60%的雇员
select * from emp where comm>(sal*0.6);

4.找出收取佣金的雇员的不同工作
select distinct job as “工作” from emp where comm is not null;

5.找出不收取佣金或者是佣金低于100的雇员
select ename as “姓名” from emp where comm is null or comm <100;

6.显示不带有R的雇员的姓名
select ename as “姓名” from emp where not ename like ‘%R%’;

7.查询工资在1500-3000之间的全部雇员信息
select * from emp where sal between 1500 and 3000;

8.显示每个雇员的年工资
select ename as “姓名”,sal*12 as “年工资” from emp;

9.检索emp表中有提成的员工的信息
select * from emp where comm is not null;10.检索月收入在800或1750的员工信息

–查询1982年1月1人后入职的员工
select * from emp where hiredate>‘01-1月 -82’;

–首字母为大写S的员工
select * from emp where ename like ‘S%’;

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–第三个字符为O的人
select * from emp where ename like ‘__O%’;

–查询员工号为 123、456,789；
select * from emp where empno in(123,456,789);

–如何显示没有上级的人(就是直列段为空)
select * from emp where mgr is null;

–工作该高于五百，岗位为manager，同时首之母为大写的J
select * from emp where sal>500 and job=‘MANAGER’ and ename like ‘J%’;

– 按照部门号升序 ，员工工资降序
select * from emp order by deptno asc,sal desc;

–使用列的别名排序
select empno as “职工号” from emp order by ‘职工号’;