數(shù)據(jù)庫實驗《實驗6》

1、實驗名稱實驗6實驗地點8-318實驗類型設(shè)計實驗學(xué)時1實驗日期2018-6-14 撰寫注意：版面格式已設(shè)置好（不得更改），填入內(nèi)容即可。一、 實驗?zāi)康?. 掌握系統(tǒng)數(shù)據(jù)類型的特點和功能。2. 掌握創(chuàng)建、修改表結(jié)構(gòu)的方法。3. 掌握插入、更新和刪除表數(shù)據(jù)的方法。二、 實驗內(nèi)容1.查詢所有班級的期末成績平均分，并按照平均分降序排序。2.查詢教師基本信息和教授課程信息，其中包括未分配課程的教師信息。3.查詢160501班級中選修了“韓晉升”老師講授的課程的學(xué)生學(xué)號、姓名、課程號和期末成績。4.查詢每門課程的課程號、課程名和選修該課程的學(xué)生人數(shù)，并按所選人數(shù)升序排序。5.查詢兩門及以上課程的期末成績超

2、過80分的學(xué)生姓名及平均成績。6.查詢?nèi)雽W(xué)考試成績最高的學(xué)生學(xué)號、姓名和入學(xué)成績。7.查詢同時教授c05127號和c05109號課程的教師信息。8.查詢至少選修了姓名為“韓吟秋”的學(xué)生所選修課程中一門課程的學(xué)生學(xué)號和姓名。9.查詢所有教授c05127號課程的教師信息。10.查詢沒有被任何學(xué)生選修的課程編號、課程名稱和學(xué)分。11.查詢“C語言”課程期末成績比“電子技術(shù)”課程期末成績高的所有學(xué)生的學(xué)號和姓名。12查詢所有班級期末平均成績的最高分，并將其賦值給變量，通過PRINT語句輸出。13.使用游標(biāo)輸出學(xué)生姓名、選修課程名稱和期末考試成績。14.使用游標(biāo)統(tǒng)計每個學(xué)院教師所開設(shè)課程的選修率。15.

3、使用游標(biāo)計算學(xué)生期末成績的等級，并更新level列。三、 實驗環(huán)境1. 操作系統(tǒng)：Windows XP2. 開發(fā)軟件：SQL Server 2008四、 提交文檔提交本實驗報告（電子版），文件名命名：學(xué)號 姓名實驗X：XXXXXXX.doc教師將批閱后（有分?jǐn)?shù)）的全體學(xué)生實驗報告刻入一張光盤存檔，保證光盤可讀。五、 附：源代碼1.select studentno,AVG(final) as 平均分 from score group by studentno order by AVG(final)2.select * from teacherselect * from studentselect

4、 * from courseinsert into course(courseno,cname,ctype,period,credit)values(c05103,高等數(shù)學(xué),必修,64,4.0) select * from scoreinsert into score(studentno,courseno,usually,final)values(16122210009,c05103,87.00,82.00)insert into teacher(teacherno,tname,major,prof,department)values(t05001,韓晉升,軟件工程,教授,計算機(jī)學(xué)院)sele

5、ct * from classinsert into class(classno,classname,department,monitor)values(160501,計算機(jī),計算機(jī)學(xué)院,張三)select * from teach_classinsert into teach_class(teacherno,classno,courseno)values(t05001,160501,c05103)select * from teacherselect * from courseselect * from scoreselect classno,AVG(final) as 平均分 from s

6、tudent join scoreon student.studentno=score.studentno group by classnoorder by AVG(final) descselect teacher.*,cname from teacher left join teach_classon teacher.teacherno=teach_class.teachernoleft join course on teach_class.classno=course.courseno3.select student.studentno,sname,cname,final from st

7、udentjoin score on student.studentno=score.studentnojoin course on course.courseno=score.coursenowhere score.courseno in(select courseno from teach_class join teacher on teach_class.teacherno=teacher.teachernowhere tname=韓晉升)and classno=0905014.select course.courseno,cname,COUNT(studentno) fromscore

8、 join course on score.courseno=course.coursenogroup by course.courseno,cnameorder by COUNT(studentno) desc5.select sname,AVG(final) from score join student on score.studentno=student.studentnowhere final=80group by student.studentno,snamehaving COUNT(courseno)=26.select studentno,sname,point from st

9、udent wherestudentno=(select top 1 studentno from student order by point)7.select teacher.teacherno,tname,major ,prof,department from teacher join teach_class on teacher.teacherno=teach_class.teachernowhere courseno=c051278.select distinct student.studentno,sname from scorejoin student on score.stud

10、entno=student.studentnowhere courseno in(select courseno from score join student onscore.studentno=student.studentnowhere sname=韓吟秋)and sname!=韓吟秋9.select * from teacher where teacherno in(select teacherno from teach_class wherecourseno=c05127)10.select courseno,cname,credit from course where not ex

11、ists(select * from score where score.courseno=course.courseno)11.select student.studentno,sname from score sc1 join studenton (sc1.studentno=student.studentno) join course c1 on(sc1.courseno=c1.courseno)where ame=c語言 and exists(select * from score sc2 join course c2 on(sc2.courseno=c2.courseno)

12、where ame=電子技術(shù) and sc1.studentno=sc2.studentnoand sc1.finalsc2.final)12.declare max numeric(6,2)select max=MAX(平均分) from (select classno as 班級號,AVG(final) as 平均分 from scorejoin student on (score.studentno=student.studentno)join course on (course.courseno=score.courseno)where final is not nullgr

13、oup by classno) tprint 所有班級期末平均成績的最高分:+cast(max as varchar(6)13.declare sname nchar(8),cname nchar(10),final numeric(6,2)declare sc_cursor cursor forselect sname,cname,finalfrom score join student on(score.studentno=student.studentno)join course on(score.courseno=course.courseno)open sc_cursorfetch

14、next from sc_cursor into sname,cname,finalprint 學(xué)生姓名 課程名稱 期末成績print -while FETCH_STATUS=0beginprint sname+cname+cast(final as nchar(6)fetch next from sc_cursor into sname,cname,finalendclose sc_cursordeallocate sc_cursor14.declare department nchar(30),num int,avg floatdeclare cur cursor staticfor se

15、lect department,count(*) as 選修課數(shù) from classwhere class.classno in(select student.classno from student group by classno)group by departmentopen curfetch curinto department,numset avg=num/(select COUNT(*) from class where department=department)print departmentprint avgwhile FETCH_STATUS=0beginfetch ne

16、xt from curinto department,numset avg=num/(select COUNT(*) from class where department=department)print departmentprint avgendclose curdeallocate cur15.declare sname nchar(30),cname nchar(30),final floatdeclare stu cursor staticforselect sname,final,cnamefrom student,score,coursewhere student.studentno=score.studentno and course.courseno=score.coursenoopen stufetch stuinto sname,final,cnameif final=90print N