数据库sql面试题及答案
【篇一:sql数据库经典面试题(修改笔试题)(有答案)】
部门,平均工资,要求按部门的字符串顺序排序,不能含有human resource部门,employee结构如下:
employee_id, employee_name,depart_id,depart_name,wage
答:
select depart_name, avg(wage)
from employee where depart_name  human resource
group by depart_name order by depart_name
-------------------------------------------------------------------------- 29.
给定如下sql数据库:test(num int(4)) 请用一条sql语句返回num的最小值,但不许使用统计
功能,如min,max等
答:
select top 1 num from test order by num
--------------------------------------------------------------------------
33.一个数据库中有两个表:
一张表为customer,含字段id,name;
一张表为order,含字段id,customerid(连向customer中id的外键),revenue;
写出求每个customer的revenue总和的sql语句。
建表  create table customer
(id int primary key,name char(10))
go
create table [order]
(id int primary key,customerid  int foreign key references
customer(id) , revenue float)
go
--查询
select customer.id, sum( isnull([order].revenue,0) )
from customer full join [order] on( [order].customerid=customer.id ) group by customer.id
  select  customer.id,vener) from order,customer where customer.id=customerid  group by customer.id
  select customer.id, vener )  from customer full join order  on( order.customerid=customer.id )  group by customer.id
5数据库(10)
a tabel called “performance”contain
:name and score,please 用
  sql语言表述
如何选出score最high的一个(仅有一个)
仅选出分数,select max(score) from performance
仅选出名字,即选出名字,又选出分数: select  top 1 score ,name  from per order by score
  select  name1,score from per where score in/=(select max(score) from per)
.....
4 有关系 s(sno,sname) c(cno,cname) sc(sno,cno,grade)
1 问上课程 db的学生no
select count(*) from c,sc where came=db and co=sco
select count(*) from sc where cno=(select cno from c where
came=db)
  2 成绩最高的学生号
select sno from sc where grade=(select max(grade) from sc )
3 每科大于90分的人数
select came,count(*) from c,sc where  co=sco and
sc.grade90 group by came
  select came,count(*) from c join sc  on  co=sco and
sc.grade90 group by came
  数据库笔试题
*
建表:
dept:
deptno(primary key),dname,loc
emp:
empno(primary key),ename,job,mgr,sal,deptno
*/
1 列出emp表中各部门的部门号,最高工资,最低工资
sql查询面试题及答案 select max(sal) as 最高工资,min(sal) as 最低工资,deptno 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1000的部门,列出job为clerk的员工的部门号,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 as b
where job=clerk and 1000(select min(sal) from emp as a where a.deptno=b.deptno) group by b.deptno
4 根据部门号由高而低,工资有低而高列出每个员工的姓名,部门号,工资
select deptno as 部门号,ename as 姓名,sal as 工资 from emp order by deptno desc,sal asc
5 写出对上题的另一解决方法
(请补充)
6 列出张三所在部门中每个员工的姓名与部门号
select ename,deptno from emp where deptno = (select deptno from emp where ename = 张三)
7 列出每个员工的姓名,工作,部门号,部门名
select ename,job,emp.deptno,dept.dname from emp,dept where emp.deptno=dept.deptno
8 列出emp中工作为clerk的员工的姓名,工作,部门号,部门名
select ename,job,dept.deptno,dname from emp,dept where
9 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) ame as 姓名,b.ename as 管理者 from emp as a,emp as b is not null =b.empno
10 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 dname as 部门名,dept.deptno as 部门号,ename as 员工名,job as 工作 from dept,emp
where dept.deptno *= emp.deptno and job = clerk
11 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 a.deptno as 部门号,a.ename as 姓名,a.sal as 工资 from emp as a where a.sal(select avg(sal) from emp as b where a.deptno=b.deptno) order by a.deptno
12 对于emp,列出各个部门中平均工资高于本部门平均水平的员工数和部门号,按部门号排序
select count(a.sal) as 员工数,a.deptno as 部门号 from emp as a
where a.sal(select avg(sal) from emp as b where a.deptno=b.deptno) group by a.deptno order by a.deptno
13 对于emp中工资高于本部门平均水平,人数多与1人的,列出部门号,人数,按部门号排
select pno) as 员工数,a.deptno as 部门号,avg(sal) as 平均工资 from emp as a
where (select pno) 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
14 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.ame,a.sal,(select ame) from emp as b where b.sala.sal) as 人数 from emp as a
where (select ame) from emp as b where b.sala.sal)5 数据库笔试题及答案
第一套
一.选择题
1. 下面叙述正确的是ccbad ______。
a、算法的执行效率与数据的存储结构无关
b、算法的空间复杂度是指算法程序中指令(或语句)的条数

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