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（'01','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（cnovarchar2（10,cnamevarchar2（10,tnovarchar2（10;insertintocoursevalues（'01','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（'03','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;insertintoscvalues（'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,sc1.score,sc2.scorefromstudents,scsc1,scsc2wheres.sno=sc1.snoands.sno=sc2.snoando='01'ando='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*fromscwherecno='02'bon（a.sno=b.snowhereo='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.snoando='01'ando='02'andsc1.score2.2、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*fromscwherecno='01'a,（select*fromscwherecno='02'bwherea.sno（+=b.snotwheres.sno=t.snoand（t.score_013、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、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5.1、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
6、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.tnoando=oandsc.sno=st.snoandte.tname='张三'
8、哪些学生没上过张三（老师）的课select*fromstudentminusselectst.*fromstudentst,courseco,teacherte,scwherete.tno=co.tnoando=oandsc.sno=st.snoandte.tname='张三'
9、查询'01''02'都学过的同学的信息selectst.*fromstudentst,（select*fromscwherecno='01'a,（select*fromscwherecno='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,（（selectsnofromscwherecno='01'minus（selectsnofromscwherecno='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,（selectdistinctsnofromscwherecnoin（selectcnofromscwheresno='01'andsno!
=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,（selectsnofromstudentminusselectsnofromscwherecno=（selectofromteachert,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,cno,scorefromscwherecno='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*fromscwherecno='01'c,（select*fromscwherecno='02'd,（select*fromscwherecno='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,（selectcno,max（scoremax_scorefromscgroupbycnob,（selectcno,min（scoremin_scorefromscgroupbycnoc,（selectcno,round（avg（score,2avg_socrefromscgroupbycnod,（select'01'cno,round（（selectcount（1fromscwherecno='01'andscore>=60/（selectcount（1fromscwherecno='01'*100,2"及格率",round（（selectcount（1fromscwherecno='01'andscore>=70andscore<80/（selectcount（1fromscwherecno='01'*100,2"中等率",round（（selectcount（1fromscwherecno='01'andscore>=80andscore<90/（selectcount（1fromscwherecno='01'*100,2"优良率",round（（selectcount（1fromscwherecno='01'andscore>=90/（selectcount（1fromscwherecno='01'*100,2"优秀率"fromdualunionselect'02'cno,round（（selectcount（1fromscwherecno='02'andscore>=60/（selectcount（1fromscwherecno='02'*100,2"及格率",round（（selectcount（1fromscwherecno='02'andscore>=70andscore<80/（selectcount（1fromscwherecno='02'*100,2"中等率",
round（（selectcount（1fromscwherecno='02'andscore>=80andscore<90/（selectcount（1fromscwherecno='02'*100,2"优良率",round（（selectcount（1fromscwherecno='02'andscore>=90/（selectcount（1fromscwherecno='02'*100,2"优秀率"fromdualunionselect'03'cno,round（（selectcount（1fromscwherecno='03'andscore>=60/（selectcount（1fromscwherecno='03'*100,2"及格率",round（（selectcount（1fromscwherecno='03'andscore>=70andscore<80/（selectcount（1fromscwherecno='03'*100,2"中等率",round（（selectcount（1fromscwherecno='03'andscore>=80andscore<90/（selectcount（1fromscwherecno='03'*100,2"优良率",round（（selectcount（1fromscwherecno='03'andscore>90/（selectcount（1fromscwherecno='03'*100,2"优秀率"fromdualewhereo=oando=oando=oando=o;
19、按各科成绩进行排序，并显示排名selectsno,cno,score,rank（over（partitionbycnoorderbyscoredesc"名次"fromsc;
selectsno,cno,score,dense_rank（over（partitionbycnoorderbyscoredesc"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,（selectcno,round（avg（score,2avg_scorefromscgroupbycnocwherea.tno=b.tnoando=oorderby"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,cno,score,rank（over（partitionbycnoorderbyscoredescorder_scfromscawherea.order_scin（2,3;
Score重复时合并名次select*from（selectsno,cno,score,dense_rank（over（partitionbycnoorderbyscoredescorder_scfromscawherea.order_scin
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