文档详情

SQL数据库经典面试题(修改笔试题)(有答案)(最新精选汇编)-(最新版-已修订).pdf

发布:2021-05-11约4.57万字共42页下载文档
文本预览下载声明
28. 数据库:抽出部门,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, 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,sum(order.revener) from order,customer where customer.id=customerid group by customer.id select customer.id, sum(order.revener ) 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 ame=db and o=o select count(*) from sc where cno=(select cno from c where ame=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 and sc.grade90 group by ame select 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,loc emp: empno(primary key),ename,job,mgr,sal,dept
显示全部
相似文档