oracle数据库增删改查练习50例答案精.docx

oracle数据库增删改查练习50例答案精.docx

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oracle数据库增删改查练习50例答案精

oracle数据库增删改查练习50例-答案

一、建表--学生表droptablestudent;createtablestudent（snovarchar2（10,snamevarchar2（10,sagedate,ssexvarchar2（10;insertintostudentvalues（'0赵雷',to_date（'1990/01/01','yyyy/mm/dd',男';insertintostudentvalues（'02'钱电',to_date（'1990/12/21','yyyy/mm/dd'，男';insertintostudentvalues（'03'孙风',to_date（'1990/05/20','yyyy/mm/dd',男';insertintostudentvalues（'04'李云',to_date（'1990/08/06','yyyy/mm/dd',男';insertintostudentvalues（'05'周梅',to_date（'1991/12/01','yyyy/mm/dd'，女';insertintostudentvalues（'06'吴兰',to_date（'1992/03/01','yyyy/mm/dd'，女';insertintostudentvalues（'07'郑竹',to_date（'1989/07/01','yyyy/mm/dd',女';insertintostudentvalues（'08'王菊',to_date（'1990/01/20','yyyy/mm/dd',女';--课程表droptablecourse;createtablecourse（enovarchar2（10,cnamevarchar2（10,tnovarchar2（10;insertintocoursevalues（'0语文','02';insertintocoursevalues（'02'数学','01';insertintocoursevalues（'03'英语','03';

--教师表droptableteacher;createtableteacher（tnovarchar2（10,tnamevarchar2（10;insertintoteachervalues（'01张三';insertintoteachervalues（'02'李四[insertintoteachervalues（'O3'王五';

--成绩表droptablesc;createtablesc（snovarchar2（10,cnovarchar2（10,scorenumber（18,1;insertintoscvalues（'01','01',80.0;insertintoscvalues（'01','02',90.0;insertintoscvalues（'01','03',99.0;insertintoscvalues（'02','01',70.0;insertintoscvalues（'02','02',60.0;insertintoscvalues（'02','03',80.0;insertintosc

values（'03','01',80.0;insertintoscvalues（'03','02',80.0;insertintoscvalues（'03','03',80.0;insertintoscvalues（'04','01',50.0;insertintoscvalues（'04','02',30.0;insertintoscvalues（'04','03',20.0;insertintoscvalues（'05','01',76.0;insertintoscvalues（'05','02',87.0;insertintoscvalues（'06','01',31.0;insertintoscvalues（'06','03',34.0;insertintoscvalues（'07','02',89.0;insertintoscvalues（'07','03',98.0;

commit;

二、查询1.1、查询同时存在"01"课程和"02"课程的情况selects.sno,s.sname,s.sage,s.ssex,scl.score,sc2.scorefromstudents,scsc1,scsc2wheres.sno=scl.snoands.sno=sc2.snoandscl.cno='01'andsc2.cno='02';

1.2、查询必须存在"01"课程，"02"课程可以没有的情况

selectt.*,s.score_01,s.score_02fromstudenttinnerjoin（selecta.sno,a.scorescore_01,b.scorescore_02fromscaleftjoin（select*fromscwhereeno='02'bon（a.sno=b.snowherea.cno='01'son（t.sno=s.sno;

2.1、查询同时'01'课程比'02'课程分数低的数据

selects.sno,s.sname,s.sage,s.ssex,sc1.score,sc2.scorefromstudents,scsc1,scsc2wheres.sno=sc1.snoands.sno=sc2.snoandsc1.cno='01'andsc2.cno='02'andsc1.score

2.2、查询同时'01'课程比'02'课程分数低或'01缺考的数据selects.sno,s.sname,s.sage,s.ssex,t.score_01,t.score_02fromstudents,（selectb.sno,a.scorescore_01,

b.scorescore_02from（select*fromscwhereeno='01'a,（select*fromscwhereeno='02'bwherea.sno（+=b.snotwheres.sno=t.snoand（t.score_01

3、查询平均成绩大于等于60分的同学的学生编号和学生姓名和平均成绩selects.sno,s.sname,t.avg_scoreavg_scorefromstudents,（selectsno,round（avg（score,2avg_scorefromscgroupbysnohavingavg（score>=60orderbysnotwheres.sno=t.sno;

4、查询平均成绩小于60分的同学的学生编号和学生姓名和平均成绩4.1、有

考试成绩，且小于60分selects.sno,s.sname,t.avg_scoreavg_scorefromstudents,

（selectsno,round（avg（score,2avg_scorefromscgroupbysnohavingavg（score<60orderbysnotwheres.sno=t.sno;

4.2、包括没有考试成绩的数据selectg.*from（selects.sno,s.sname,nvl（t.avg_score,0avg_scorefromstudents,（selectsno,round（avg（score,2avg_scorefromscgroupbysnoorderbysnotwheres.sno=t.sno（+gwhereg.avg_score<60;

5.1、

5、查询所有同学的学生编号、学生姓名、选课总数、所有课程的总成绩

查询所有成绩的（不含缺考的）。

selects.sno,s.sname,c.count_cno,c.sum_scorefromstudents,（selectsno,count（cnocount_cno,sum（scoresum_scorefromscgroupbysnoorderbysnoc

wheres.sno=c.sno

5.2、查询所有成绩的（包括缺考的。

selecta.s_sno,a.s_sname,nvl（a.c_cno,0,a.s_scorefrom（selects.snos_sno,s.snames_sname,c.count_cnoc_cno,c.sum_scores_scorefromstudents,（selectsno,count（cnocount_cno,sum（scoresum_scorefromscgroupbysnoorderbysnocwheres.sno=c.sno（+a

&查询"李"姓老师的数量（有几个老师姓李）selectcount（tnfrom（selecttno,substr（tname,0,1tnfromteacherwheresubstr（tname,0,1李'a;

7、哪些学生上过张三（老师）的课selectst.*fromstudentst,courseco,teacherte,scwherete.tno=co.tnoandco.cno=sc.cnoandsc.sno=st.snoandte.tnamefe三'

8、哪些学生没上过张三（老师）的课select*fromstudentminusselectst.*fromstudentst,courseco,teacherte,scwherete.tno=co.tnoandco.cno=sc.cnoandsc.sno=st.snoandte.tname=张三'

9、查询'01''02都学过的同学的信息selectst.*fromstudentst,（select*fromscwhereeno='01'a,（select*fromscwhereeno='02'bwherest.sno=a.snoandst.sno=b.sno

10、查询学过编号为'01但是没有学过编号为’02'的课程的同学的信息selectst.*fromstudentst,（（selectsnofromscwhereeno='01'minus（selectsnofromscwhereeno='02'awherest.sno=a.sno;

11、查询没有学全所有课程的同学的信息11.1学完所有课程的selectst.*fromstudentst,（selectsno,count（cnofromscgroupbysnohavingcount（cno=3awherest.sno=a.sno;

11.2没有学完所有课程的selectst.*fromstudentst,

（selectsnofromstudentminusselectsnofromscgroupbysnohavingcount（cno=3awherest.sno=a.sno;

12、查询至少有一门课与学号为'01'的同学所学相同的同学的信息selectst.*fromstudentst,（selectdistinetsnofromscwhereenoin（selectenofromscwheresno='01'andsno匸1awherest.sno=a.sno;

13、查询和'01'号的同学学习的课程完全相同的其他同学的信息selectst.*fromstudentst,（selectsnofrom（selectsno,count（cnoCNT1fromscgroupbysnoa,（selectcount（cnoCNT2fromscwheresno='01'bwherea.CNT1=b.CNT2anda.sno!

='01'cwherest.sno=c.sno;

14、查询没学过"张三"老师讲授的任一门课程的学生姓名selectst.*fromstudentst,（selectsnofromstudentminusselectsnofromscwhereeno=（selectc.cnofromteachert,coursecwheret.tno=c.tnoandtname张三'awherest.sno=a.sno;

15、查询两门及其以上不及格课程的同学的学号，姓名及其平均成绩selecta.sno,st.sname,a.avg_scorefromstudentst,（selectsno,count（cno,round（avg（score,2avg_scorefrom（select*fromscwherescore<60groupbysnoawherest.sno=a.sno;

16、检索'01'课程分数小于60,按分数降序排列的学生信息selectst.*,o.

a.scorefromstudentst,（selectsno,eno,scorefromscwhereeno='01'andscore<60orderbyscoredescawherest.sno=a.sno;

17、按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩selectst.sno,st.sname,c.score,d.score,e.score,a.avg_scorefromstudentst,（selectsno,round（avg（score,2avg_scorefromscgroupbysno

orderbyavg_scoredesca,（select*fromscwhereeno='01'c,（select*fromscwhereeno='02'd,（select*fromscwhereeno='03'ewherest.sno=a.sno（+andst.sno=c.sno（+andst.sno=d.sno（+andst.sno=e.sno（+

18、查询各科成绩最高分、最低分和平均分：

以如下形式显示：

课程ID，课

程name,最高分，最低分，平均分，及格率，中等率，优良率，优秀率selecto"课程编号",ame"课程名称",b.max_score最高分",c.min_score"最低分",d.avg_socre平均分",e."及格率",e."中等率",e."优良率",e."优秀率"fromcoursea,（selecteno,max（scoremax_scorefromscgroupbyenob,（selecteno,min（scoremin_scorefromscgroupbyenoc,（selecteno,round（avg（score,2avg_socrefromscgroupbyenod,（select'01'eno,round（（selectcount（1fromscwhereeno='01'andscore>=60/（selectcount（1fromscwhereeno='01'*100,2及格率",round（（selectcount（1fromscwhereeno='01'andscore>=70andscore<80/（selectcount（1fromscwhereeno='01'*100,2"中等率",round（（selectcount（1fromscwhereeno='01'andscore>=80andscore<90/（selectcount（1fromscwhereeno='01'*100,2优良率",round（（selectcount（1fromscwhereeno='01'andscore>=90/（selectcount（1fromscwhereeno='01'*100,2"优秀率"fromdualunionselect'02'cno,round（（selectcount（1fromscwhereeno='02'andscore>=60/（selectcount（1fromscwhereeno='02'*100,

2"及格率",round（（selectcount（1fromscwhereeno='02'andscore>=70andscore<

80/（selectcount（1fromscwhereeno='02'*100,2中等率",

round（（selectcount（1fromscwhereeno='02'andscore>=80andscore<90/（selectcount（1fromscwhereeno='02'*100,2忧良率",round（（selectcount（1fromscwhereeno='02'andscore>=90/（selectcount（1fromscwhereeno='02'*100,2优秀率"fromdualunionselect'03'cno,round（（selectcount（1fromscwhereeno='03'andscore>=60/（selectcount（1fromscwhereeno='03'*100,2及格率",round（（selectcount（1fromscwhereeno='03'andscore>=70andscore<80/（selectcount（1fromscwhereeno='03'*100,2"中等率",round（（selectcount（1fromscwhereeno='03'andscore>=80andscore<90/（selectcount（1fromscwhereeno='03'*100,2优良率",round（（selectcount（1fromscwhereeno='03'andscore>90/（selectcount（1fromsc

whereeno='03'*100,2'优秀率"fromdualewhereo=oando=oanda.cno=d.cnoanda.cno=e.cno;

19、按各科成绩进行排序，并显示排名selectsno,eno,score,

rank（over（partitionbyenoorderbyscoredesc名次"fromsc;

selectsno,eno,score,dense_rank（over（partitionbyenoorderbyscoredes名次"

fromsc;

20、查询学生的总成绩并进行排名20.1查询学生的总成绩selecta.sno,a.sname,nvl（b.sum_score,0总、成绩"fromstudenta,（selectsno,sum（scoresum_scorefromscgroupbysnoorderbysnobwherea.sno=b.sno（+;

20.2查询学生的总成绩并进行排名。

selectc."学生编号",c."学生姓名",c."总成

绩",rank（over（orderbyc."总成绩"desc"排名"from（selecta.sno"学生编号",a.sname"学生姓名",nvl（b.sum_score,0"总成绩"fromstudenta,（selectsno,sum（scoresum_scorefromscgroupbysnoorderbysnobwherea.sno=b.sno（+c

21、查询不同老师所教不同课程平均分从高到低显示selecta.tno,a.tname,

c.avg_score平均分"fromteachera,courseb,（selecteno,round（avg（score,2avg_scorefromscgroupbyenocwherea.tno=b.tnoandb.cno=c.cnoorderby平均分"desc;

22、查询所有课程的成绩第2名到第3名的学生信息及该课程成绩Score重复

时保留名次空缺select*from（selectsno,eno,score,rank（over（partition