oracle数据库增删改查练习50例 答案精

1、 oracle 数据库增删改查练习50例-答案 一、建表-学生表drop table student;create table student (sno varchar2(10,sname varchar2(10,sage date,ssex varchar2(10;insert into student values(01,赵雷,to_date(1990/01/01,yyyy/mm/dd,男;insert into student values(02,钱电,to_date(1990/12/21,yyyy/mm/dd,男;insert into student values(03,孙风,to_

2、date(1990/05/20,yyyy/mm/dd,男;insert into student values(04,李云,to_date(1990/08/06,yyyy/mm/dd,男;insert into student values(05,周梅,to_date(1991/12/01,yyyy/mm/dd,女;insert into student values(06,吴兰,to_date(1992/03/01,yyyy/mm/dd,女;insert into student values(07,郑竹,to_date(1989/07/01,yyyy/mm/dd,女;insert into

3、 student values(08,王菊,to_date(1990/01/20,yyyy/mm/dd,女;-课程表drop table course;create table course (cno varchar2(10,cname varchar2(10,tno varchar2(10;insert into course values (01,语文,02;insert into course values (02,数学,01;insert into course values (03,英语,03; -教师表drop table teacher;create table teacher

4、(tno varchar2(10,tname varchar2(10;insert into teacher values(01,张三;insert into teacher values(02,李四;insert into teacher values(03,王五; -成绩表drop table sc;create table sc (sno varchar2(10,cno varchar2(10,score number(18,1;insert into sc values(01,01,80.0;insert into sc values(01,02,90.0;insert into sc

5、 values(01,03,99.0;insert into sc values(02,01,70.0;insert into sc values(02,02,60.0;insert into sc values(02,03,80.0;insert into sc values(03,01,80.0;insert into sc values(03,02,80.0;insert into sc values(03,03,80.0;insert into sc values(04,01,50.0;insert into sc values(04,02,30.0;insert into sc va

6、lues(04,03,20.0;insert into sc values(05,01,76.0;insert into sc values(05,02,87.0;insert into sc values(06,01,31.0;insert into sc values(06,03,34.0;insert into sc values(07,02,89.0;insert into sc values(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select s.sno, s.sname, s.sage, s.ssex, sc1.score, s

7、c2.score from student s, sc sc1, sc sc2 where s.sno = sc1.sno and s.sno = sc2.sno and o = 01 and o = 02; 1.2、查询必须存在01课程，02课程可以没有的情况 select t.*, s.score_01, s.score_02 from student t inner join (select a.sno, a.score score_01, b.score score_02 from sc a left join (select * from sc where c

8、no = 02 b on (a.sno = b.sno where o = 01 s on (t.sno = s.sno; 2.1、查询同时01课程比02课程分数低的数据 select s.sno, s.sname, s.sage, s.ssex, sc1.score, sc2.score from student s, sc sc1, sc sc2 where s.sno = sc1.sno and s.sno = sc2.sno and o = 01 and o = 02 and sc1.score sc2.score; 2.2、查询同时01课程比02课程分

9、数低或01缺考的数据select s.sno, s.sname, s.sage, s.ssex, t.score_01, t.score_02 from student s, (select b.sno, a.score score_01, b.score score_02 from (select * from sc where cno = 01 a, (select * from sc where cno = 02 b where a.sno(+ = b.sno t where s.sno = t.sno and (t.score_01 = 60 order by sno t where

10、s.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select s.sno, s.sname, t.avg_score avg_score from student s, (select sno, round(avg(score, 2 avg_score from sc group by sno having avg(score 60 order by sno t where s.sno = t.sno; 4.2、包括没有考试成绩的数据select g.* from (select s.sno, s.sname, nvl

11、(t.avg_score, 0 avg_score from student s, (select sno, round(avg(score, 2 avg_score from sc group by sno order by sno t where s.sno = t.sno(+ g where g.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）。select s.sno,s.sname,c.count_cno,c.sum_scorefrom student s,(select sno,count(cno co

12、unt_cno,sum(score sum_score from sc group by sno order by sno c where s.sno = c.sno 5.2、查询所有成绩的(包括缺考的。select a.s_sno, a.s_sname, nvl(a.c_cno, 0, a.s_score from (select s.sno s_sno, s.sname s_sname, c.count_cno c_cno, c.sum_score s_score from student s, (select sno, count(cno count_cno, sum(score sum

13、_score from sc group by sno order by sno c where s.sno = c.sno(+ a 6、查询李姓老师的数量 （有几个老师姓李）select count(tn from (select tno, substr(tname, 0, 1 tn from teacher where substr(tname, 0, 1 = 李 a; 7、哪些学生上过张三（老师）的课select st.* from student st, course co, teacher te, sc where te.tno = co.tno and o =

14、o and sc.sno = st.sno and te.tname = 张三 8、哪些学生没上过张三（老师）的课select * from studentminus select st.* from student st, course co, teacher te, sc where te.tno = co.tno and o = o and sc.sno = st.sno and te.tname = 张三 9、查询 01 02都学过的同学的信息select st.* from student st, (select * from sc where cno = 01

15、a, (select * from sc where cno = 02 b where st.sno = a.sno and st.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select st.* from student st, (select sno from sc where cno = 01 minus (select sno from sc where cno = 02 a where st.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select st.* from student st, (

16、select sno, count(cno from sc group by sno having count(cno = 3 a where st.sno = a.sno; 11.2 没有学完所有课程的select st.* from student st, (select sno from student minus select sno from sc group by sno having count(cno = 3 a where st.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select st.* from student st, (s

17、elect distinct sno from sc where cno in (select cno from sc where sno = 01 and sno != 1 a where st.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select st.* from student st, (select sno from (select sno, count(cno CNT1 from sc group by sno a, (select count(cno CNT2 from sc where sno = 01 b where a.CNT1

18、= b.CNT2 and a.sno != 01 c where st.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select st.* from student st, (select sno from student minus select sno from sc where cno = (select o from teacher t, course c where t.tno = c.tno and tname = 张三 a where st.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select

19、 a.sno, st.sname, a.avg_score from student st, (select sno, count(cno, round(avg(score, 2 avg_score from (select * from sc where score 60 group by sno a where st.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select st.*, o, a.score from student st, (select sno, cno, score from sc where cno = 01 and s

20、core = 60 / (select count(1 from sc where cno = 01 * 100, 2 及格率, round(select count(1 from sc where cno = 01 and score = 70 and score = 80 and score = 90 / (select count(1 from sc where cno = 01 * 100, 2 优秀率 from dual union select 02 cno, round(select count(1 from sc where cno = 02 and score = 60 /

21、(select count(1 from sc where cno = 02 * 100, 2 及格率, round(select count(1 from sc where cno = 02 and score = 70 and score = 80 and score = 90 / (select count(1 from sc where cno = 02 * 100, 2 优秀率 from dual union select 03 cno, round(select count(1 from sc where cno = 03 and score = 60 / (select coun

22、t(1 from sc where cno = 03 * 100, 2 及格率, round(select count(1 from sc where cno = 03 and score = 70 and score = 80 and score 90 / (select count(1 from sc where cno = 03 * 100, 2 优秀率 from dual e where o = o and o = o and o = o and o = o; 19、按各科成绩进行排序，并显示排名select sno, c

23、no, score, rank( over(partition by cno order by score desc 名次 from sc; select sno, cno, score, dense_rank( over(partition by cno order by score desc 名次 from sc; 20、查询学生的总成绩并进行排名20.1 查询学生的总成绩select a.sno, a.sname, nvl(b.sum_score, 0 总成绩 from student a, (select sno, sum(score sum_score from sc group b

24、y sno order by sno b where a.sno = b.sno(+; 20.2 查询学生的总成绩并进行排名。select c.学生编号,c.学生姓名,c.总成绩,rank( over (order by c.总成绩 desc 排名from (select a.sno 学生编号, a.sname 学生姓名, nvl(b.sum_score, 0 总成绩 from student a, (select sno, sum(score sum_score from sc group by sno order by sno b where a.sno = b.sno(+ c 21、查询

25、不同老师所教不同课程平均分从高到低显示select a.tno, a.tname, c.avg_score 平均分 from teacher a, course b, (select cno, round(avg(score, 2 avg_score from sc group by cno c where a.tno = b.tno and o = o order by 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 (select sno, cno, score, rank( over

26、(partition by cno order by score desc order_sc from sc a where a.order_sc in (2, 3; Score 重复时合并名次 select * from (select sno, cno, score, dense_rank( over(partition by cno order by score desc order_sc from sc a where a.order_sc in (2, 3; 23 、 统 计 各 科 成 绩 各 分 数 段 人 数 ： 课 程 编 号 , 课 程 名称,100-85,85-70,70

27、-60,0-60及所占百分比23.1 统 计 各 科 成 绩 各 分 数 段 人 数 ： 课 程 编 号 , 课 程 名称,100-85,85-70,70-60,0-60select o, ame, b.85-100, b.70-85, b.60-70, b.0-60 from course a, (select 01 cno, (select count(1 from sc where cno = 01 and score = 85 and score = 70 and score = 60 and score 70 60-70, (select count(1 from s

28、c where cno = 01 and score = 85 and score = 70 and score = 60 and score 70 60-70, (select count(1 from sc where cno = 02 and score = 85 and score = 70 and score = 60 and score 70 60-70, (select count(1 from sc where cno = 03 and score 60 0-60 from dual b where o = o; 纵向显示 1(显示存在的分数段; select

29、o, ame, b.ff, b.c1 from course a, (select cno, c1, 0-60 ff from (select cno, count(1 c1 from sc where score = 60 and score = 70 and score = 85 and score = 100 group by cno b where o = o 23.2 统 计 各 科 成 绩 各 分 数 段 人 数 ： 课 程 编 号 , 课 程 名称,100-85,85-70,70-60,60及所占百分比横向显示select o, aa.c

30、name, bb.0-60, bb.1百分比(%, bb.60-70, bb.2百分比(%, bb.70-85, bb.3百分比(%, bb.85-100, bb.4百分比(% from course aa, (select 01 cno, (select count(1 from sc where cno = 01 and score 60 0-60, round(select count(1 from sc where cno = 01 and score = 60 and score = 60 and score = 70 and score = 70 and score = 85 an

31、d score = 85 and score = 100 * 100 / (select count(1 from sc where cno = 01, 2 4百分比(% from dual union (select 02 cno, (select count(1 from sc where cno = 02 and score 60 0-60, round(select count(1 from sc where cno = 02 and score = 60 and score = 60 and score = 70 and score = 70 and score = 85 and s

32、core = 85 and score = 100 * 100 / (select count(1 from sc where cno = 02, 2 4百分比(% from dual union (select 03 cno, (select count(1 from sc where cno = 03 and score 60 0-60, round(select count(1 from sc where cno = 03 and score = 60 and score = 60 and score = 70 and score = 70 and score = 85 and scor

33、e = 85 and score = 85 then 85-100 when n.score = 70 and n.score = 60 and n.score = 85 then 85-100 when n.score = 70 and n.score = 60 and n.score 70 then 60-70 else 0-60 end order by o, ame, px t1, (select o, ame, count(1 all_num from course m, sc n where o = o group by o,

34、 ame order by o, ame t2 where o = o 24、 查询学生的平均成绩并进行排名select c.sno, st.sname, c.avg_score, c.paim from student st, (select b.*, rownum paim from (select a.sno, round(avg(score, 2 avg_score from (select s.sno sno, nvl(sc.score, 0 score from student s, sc where s.sno = sc.sno(+ a

35、 group by a.sno order by avg_score desc b c where st.sno = c.sno; 25、查询各科成绩前三名的记录25.1 分数重复时保留名次空缺select st.*, o, d.score from student st, (select a.* from (select * from sc where cno = 01 order by score desc a where rownum = 3 union all select b.* from (select * from sc where cno = 02 order by s

36、core desc b where rownum = 3 union all select c.* from (select * from sc where cno = 03 order by score desc c where rownum = 3 d where st.sno = d.sno 25.2 分数重复时不保留名次空缺，合并名次select st.sno,st.sname,st.sage,st.ssex,o,b.score,b.paimfrom student st,(select sno,cno,score,paim from (select sno, cno, sco

37、re, dense_rank( over(partition by cno order by score desc paim from sc awhere a.paim = 85 a where st.sno = a.sno; 34、查询课程名称为数学，且分数低于60的学生姓名和分数select st.sname,a.scorefrom student st,(select sno, score from sc where cno = (select cno from course where cname = 数学 and score = 70 a where st.sno = a.sno a

38、nd a.sno = sc.sno and o = o 37、查询不及格的课程 select st.*,ame,o,a.scorefrom student st,course c,(select * from sc where score = 80 awhere st.sno = a.snoand o = o 39、求每门课程的学生人数select o,ame,from course c,(select cno,count(sno cn from sc group by cno awhere o = o 40、查询选修张三老师所授课程的学生中，成绩最高的学生信息及其成绩select st.*, ame, o, b.score from student st, course c, (select * from sc where score = (select max(score from (select * from sc where cno = (select cno from course where tno = (select tno from