实验3 数据检索 一、实验目的
(1)理解T-SQL语言的使用。<o:p></o:p>
(2)熟练掌握数据查询语句。<o:p></o:p>
SELECT [ALL|DISTINCT] {*|<表达式>,…,<表达式>}<o:p></o:p>
FROM <表名>[, <表名>…]<o:p></o:p>
[WHERE <条件>]<o:p></o:p>
[GROUP BY <列名>[, <列名>…][HAVING <谓词>]]<o:p></o:p>
[ORDER BY <列名> [ASC|DESC] [, <列名> ASC|DESC]…]<o:p></o:p>
[COMPUTE …] <o:p></o:p>
<o:p> </o:p> 二、实验内容 1、 [3.2]b USE CAP
select aid from AGENTS where [percent]=(select max([percent] )from AGENTS [3.5] Select cid,aid from customers c, agents a Where cid not in (select cid from orders x
Where x.cid = c.cid and x.aid = a.aid) And
aid not in (select aid from orders v Where v.aid = a.aid and v.cid = c.cid) [3.8]a select cid,max(dollars) as MAXSPEND from orders group by cid [3.8]b select avg(MAXSPEND) average,cid from (select cid,max(dollars) as MAXSPEND from orders group by cid)as S group by cid [3.11]b Select avg(temp.maxspend)avgspend,temp.cid
from (select cid,max(dollars) as maxspend from orders
Group by cid) as temp group by temp.cid [3.11]f select pid from products p
where not exists(select cid from customers c where city='Duluth'
and not exists (select * from orders o where o.cid=c.cid and o.pid=p.pid)) [3.11]j update products
set price=price*1.1 where city='Duluth' or city='Dallas' [3.11]l select aid,[percent] from agents a where not exists(select * from customers c
where city='Duluth' and not exists
(select * from orders o where o.cid=c.cid and o.aid=a.aid)) order by [percent]DESC<o:p></o:p>
<选做>[3.15]、[3.16]、[3.17]<o:p></o:p>
<o:p> </o:p> 2、在“学生管理数据库”中建立四张表,分别如下:<o:p></o:p> 学生表:(主键:学号)<o:p></o:p>