陈石良.txt

关于oracle和sql的书籍和ppt教程,非常好,本人珍藏品

以下练习以emp,dept为准进行查询：
1，查询出每种工作的平均工资
2，查询出那种工作的工资最高
3，查询出工资最底的经理的名字
4，查询出部门编号为30的部门里面那种工作的平均工资最高
5，查询出名字中带K的经理
6，统计出各个部门的各个工作岗位的平均工资


1.select job,avg(sal) from emp group by job;

2.select job from emp where sal=(select max(sal) from emp) group by job;

3.select ename,sal,job from emp where sal=(select min(sal) from emp where job='MANAGER') and job='MANAGER';

4.select deptno,job,avg(sal) from emp group by deptno,job having deptno=30 and avg(sal)>=(select avg(sal) from emp);


5.select * from emp where ename like '%K%' and job='MANAGER';

6.select deptno,job,avg(sal) from emp group by cube (deptno,job);