SQL复习题带答案

二、简答题，按要求写出SQL语句，使用SQL标准语句

Create table dept

(

Deptno varchar(10) primary key

Dname varchar(10)

);

Create table emp

(

Empno varchar(10) primary key

Ename varchar(10)

Job varchar(10)

Mgr varchar(10)

Sal varchar(10)

Deptno varchar(10) references dept(deptno)

);

Drop table dept;

Drop table emp;

Insert into dept values(‘1’,’事业部’);

Insert into dept values(‘2’,’销售部’);

Insert into dept values(’3’,’技术部’);

Insert into emp values(‘01’,’jacky’,’clerk’,’tom’,’1000’,’1’);

Insert into emp values(‘02’,’tom’,’clerk’,’’,’2000’,’1’);

Insert into emp values(‘07’,’biddy’,’clerk’,’’,’2000’,’1’);

Insert into emp values(‘03’,’jenny’,’sales’,’prety’,’600’,’2’);

Insert into emp values(‘04’,’pretty’,’sales’,’’,’800’,’2’);

Insert into emp values(‘05’,’buddy’,’jishu’,’canndy’,’1000’,’3’);

Insert into emp values(‘06’,’canndy’,’jishu’,’’,’1500’,’3’);

Select*from dept;

Select*from emp;

1、 列出emp表中各部门的部门号，最高工资，最低工资

select deptno as 部门号,max(sal) as 最高工资,min(sal) as 最低工资 from

emp group by deptno;

2、 列出emp表中各部门job为’CLERK’的员工的最低工资，最高工资。

select max(sal) as 最高工资,min(sal) as 最低工资,deptno as 部门号 from emp where

job='clerk' group by deptno;

3、 对于emp中最低工资小于2000的部门。列出job为’CLERK’的员工的部门号，最低工资，最高工资

select b.deptno as 部门号,max(sal) as 最高工资,min(sal) as 最低工资 from emp as b where job='clerk' and (select min(sal)from emp as a where a.deptno=b.deptno)<2000 group by b.deptno;

4、 根据部门号由高到低，工资由低到高对应每个员工的姓名，部门号，工资

select ename as 姓名,deptno as 部门号,sal as 工资 from emp order by deptno desc,sal asc;

5、 列出’buddy’所在部门中每个员工的姓名与部门号

select b.ename as 姓名,b.deptno as 部门号 from emp as b where b.deptno= (select a.deptno from emp as a where a.ename='buddy');

6、 列出每个员工的姓名，工资，部门号，部门名

select ename as 姓名,job as 工作,dept.deptno as 部门号,dept.dname as 部门名 from emp,dept where emp.deptno=dept.deptno;

7、 列出emp中工作为’CLERK’的员工的姓名，工作，部门号，部门名

select ename as 姓名,job as 工作,dept.deptno as 部门号,dept.dname as 部门名 from emp,dept where emp.deptno=dept.deptno and job='clerk';

8、 对于emp中有管理者的员工，列出姓名，管理者姓名（管理者外键为mgr）

select a.deptno as 部门号,a.ename as 员工,b.ename as 管理者 from emp as a,emp as b where a.mgr is not null and a.mgr=b.ename;

9、 对于dept表中，列出所有部门名，部门号，同时列出各部门工作为’CLERK’

的员工名与工作

select a.deptno as 部门号,a.dname as 部门名,b.ename as 员工名,b.job as 工作 from dept as a, emp as b where a.deptno=b.deptno and b.job='clerk';

10、对于工资高于本部门平均水平的员工，列出部门号，姓名，工资，按部门号排序

select b.deptno as 部门号,b.ename as 姓名,b.sal as 工资 from emp as b where b.sal>(select avg(a.sal) from emp as a where a.deptno=b.deptno) order by b.deptno;

11、对于emp，列出各个部门中工资高于本部门平均工资的员工数和部门号，按部门号排序

select a.deptno as 部门号,count(a.sal) as 员工数 from emp as a where a.sal>(select avg(b.sal) from emp as b where a.deptno=b.deptno) group by a.deptno order by a.deptno;

12、对于emp中工资高于本部门平均水平，人数多于1人的，列出部门号，人数，平均工资，按部门号排序

select count(a.empno) as 员工数,a.deptno as 部门号,avg(sal) as 平均工资 from emp as a where (select count(c.empno) from emp as c where c.deptno=a.deptno and c.sal>(select avg(sal) from emp as b where c.deptno=b.deptno))>1 group by a.deptno order by a.deptno;

13、对于emp中低于自己工资至少5人的员工，列出其部门号，姓名，工资，以及工资少于自己的人数

select a.deptno as 部门号,a.ename as 姓名,a.sal as 工资,(select count(b.ename) from emp as b where b.sal=5