一、數據表設計圖
二、創建語句
alter table "emp"
drop constraint FK_EMP_REFERENCE_DEPT;
drop table "dept" cascade constraints;
drop table "emp" cascade constraints;
drop table "salgrade" cascade constraints;
create table dept (
deptno NUMBER(11) not null,
dname VARCHAR2(15) not null,
loc VARCHAR2(15) not null,
constraint PK_DEPT primary key (deptno)
);
create table emp (
empno NUMBER(11) not null,
deptno NUMBER(11),
ename VARCHAR2(15) not null,
sal NUMBER(11) not null,
job VARCHAR2(15) not null,
mgr NUMBER(11) not null,
hirdate DATE not null,
comm NUMBER(11) not null,
constraint PK_EMP primary key (empno)
);
create table salgrade (
grade NUMBER(11) not null,
losal NUMBER(11) not null,
hisal NUMBER(11) not null,
constraint PK_SALGRADE primary key (grade)
);
alter table emp
add constraint FK_EMP_REFERENCE_DEPT foreign key (deptno)
references dept (deptno);
三、測試要求及語句
select t.ename,t.sal from emp t where t.sal =
(
select max(sal) from emp
)
select e1.ename,e2.ename from emp e1 join emp e2 on (e1.mgr = e2.empno)
select s.grade from salgrade s where
(select avg(t.sal) from emp t) between s.losal and s.hisal
select d.dname,ename,sal from
(select t.deptno,ename,sal from
(select deptno,max(sal) as max_sal from emp group by deptno) e
join emp t on (e.deptno = t.deptno and t.sal = max_sal)
) et
join dept d on (d.deptno = et.deptno)
select d.dname,avg_sal,grade from
(select deptno,avg_sal,grade from
(select deptno,avg(sal) as avg_sal from emp group by deptno) e
join salgrade s on (e.avg_sal between s.losal and s.hisal )
) es
join dept d on (es.deptno = d.deptno)
select deptno,avg(grade) from
(select deptno,grade from emp e join salgrade s on (e.sal between s.losal and s.hisal)) t
group by t.deptno
select ename from emp e
where empno in (select distinct mgr from emp)
select ename from emp
where empno not in
(select distinct e1.empno from emp e1
join emp e2 on (e1.sal<e2.sal)
)
select d.deptno,dname from
(select deptno,avg(sal) avg_sal from emp group by deptno) t1
join dept d on (d.deptno = t1.deptno)
where avg_sal =
(select max(avg_sal) from
(select deptno,avg(sal) avg_sal from emp group by deptno) t2
)
select dname from dept d
where d.deptno in (
select deptno from
(
select deptno,grade from
(select deptno,avg(sal) avg_sal from emp group by deptno) t1
join salgrade g on (avg_sal between g.losal and g.hisal)
) t2
where t2.grade =
(
select min(grade) from
(
select deptno,grade from
(select deptno,avg(sal) avg_sal from emp group by deptno) t1
join salgrade g on (avg_sal between g.losal and g.hisal)
) t3
)
)
select d.dname,t1.avg_sal from dept d
join
(
select deptno,avg(sal) avg_sal from
(
select e2.deptno,e2.ename,e2.sal from emp e1
join emp e2 on (e1.mgr = e2.empno)
) t
group by deptno
) t1
on (d.deptno = t1.deptno)
where avg_sal =
(
select min(avg_sal) from
(
select deptno,avg(sal) avg_sal from
(
select e2.deptno,e2.ename,e2.sal from emp e1
join emp e2 on (e1.mgr = e2.empno)
) t
group by deptno
)
)
select ename from
(
select e2.ename,e2.empno,e2.sal from emp e1
join emp e2 on (e1.mgr = e2.empno)
) t
where t.sal >
(
select max(e.sal) from emp e
where e.empno not in
(
select e1.mgr from emp e1
join emp e2 on (e1.mgr = e2.empno)
)
)
SELECT * FROM
(
SELECT A.*, ROWNUM RN
FROM (SELECT * FROM (select e1.ename,e1.sal from emp e1 order by e1.sal desc)) A
WHERE ROWNUM <= 10
)
WHERE RN >= 6
原文地址：http://www.zhuoda.org/lunzi/98685.html 
