数据库笔试题及答案【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 resourcegroup 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))gocreate table [order](id int primary key,customerid int foreign key referencescustomer(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.idselect customer.id,sum(order.revener) from order,customer where customer.id=customerid group by customer.idselect customer.id, sum(order.revener ) from customer full join order on( order.customerid=customer.id ) group by customer.id5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 1score ,name from per order by scoreselect name1,score from per where score in/=(selectmax(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noselect count(*) from c,sc where ame=db and o=o select count(*) from sc where cno=(select cno from c whereame=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 ame,count(*) from c,sc where o=o andsc.grade90 group by ameselect ame,count(*) from c join sc on o=o and sc.grade90 group by ame数据库笔试题*建表:dept:deptno(primary key),dname,locemp: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 bwhere job=clerk and 1000(select min(sal) from emp as a wherea.deptno=b.deptno) group by b.deptno4 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 asc5 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,deptwhere emp.deptno=dept.deptno8 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 wheredept.deptno=emp.deptno and job=clerk9 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.ename as 姓名,b.ename as 管理者 from emp as a,emp as b where a.mgr is not null and a.mgr=b.empno10 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,empwhere dept.deptno *= emp.deptno and job = clerk11 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 wherea.deptno=b.deptno) order by a.deptno12 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 awhere a.sal(select avg(sal) from emp as b wherea.deptno=b.deptno) group by a.deptno order by a.deptno13 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 awhere (select count(c.empno) from emp as c wherec.deptno=a.deptno and c.sal(select avg(sal) from emp as b where c.deptno=b.deptno))1 group by a.deptno order bya.deptno14 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,a.ename,a.sal,(select count(b.ename) from emp as b where b.sala.sal) as 人数 from emp as awhere (select count(b.ename) from emp as b whereb.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c、算法的有穷性是指算法必须能在执行有限个步骤之后终止d、以上三种描述都不对2. 以下数据结构中不属于线性数据结构的是______。
a、队列b、线性表c、二叉树d、栈3. 在一棵二叉树上第5层的结点数最多是______。
a、8 b、16 c、32 d、154. 下面描述中,符合结构化程序设计风格的是______。
a、使用顺序、选择和重复(循环)三种基本控制结构表示程序的控制逻辑b、模块只有一个入口,可以有多个出口c、注重提高程序的执行效率d、不使用goto语句5. 下面概念中,不属于面向对象方法的是______。
a、对象b、继承c、类d、过程调用6. 在结构化方法中,用数据流程图(dfd)作为描述工具的软件开发阶段是___ bdbca ___。