Oracle练习题

 1 create table student(
 2 sno varchar2(10) primary key,
 3 sname varchar2(20),
 4 sage number(2),
 5 ssex varchar2(5)
 6 );
 7 create table teacher(
 8 tno varchar2(10) primary key,
 9 tname varchar2(20)
10 );
11 create table course(
12 cno varchar2(10),
13 cname varchar2(20),
14 tno varchar2(20),
15 constraint pk_course primary key (cno,tno)
16 );
17 create table sc(
18 sno varchar2(10),
19 cno varchar2(10),
20 score number(4,2),
21 constraint pk_sc primary key (sno,cno)
22 );

 1 /*******初始化学生表的数据**********/
 2 insert into student values (‘s001‘,‘张三‘,23,‘男‘);
 3 insert into student values (‘s002‘,‘李四‘,23,‘男‘);
 4 insert into student values (‘s003‘,‘吴鹏‘,25,‘男‘);
 5 insert into student values (‘s004‘,‘琴沁‘,20,‘女‘);
 6 insert into student values (‘s005‘,‘王丽‘,20,‘女‘);
 7 insert into student values (‘s006‘,‘李波‘,21,‘男‘);
 8 insert into student values (‘s007‘,‘刘玉‘,21,‘男‘);
 9 insert into student values (‘s008‘,‘萧蓉‘,21,‘女‘);
10 insert into student values (‘s009‘,‘陈萧晓‘,23,‘女‘);
11 insert into student values (‘s010‘,‘陈美‘,22,‘女‘);
12 insert into student values (‘s011‘,‘陈美‘,23,‘女‘);
13 commit;
14 /******************初始化教师表***********************/
15 insert into teacher values (‘t001‘, ‘刘阳‘);
16 insert into teacher values (‘t002‘, ‘谌燕‘);
17 insert into teacher values (‘t003‘, ‘胡明星‘);
18 commit;
19 /***************初始化课程表****************************/
20 insert into course values (‘c001‘,‘J2SE‘,‘t002‘);
21 insert into course values (‘c002‘,‘Java Web‘,‘t002‘);
22 insert into course values (‘c003‘,‘SSH‘,‘t001‘);
23 insert into course values (‘c004‘,‘Oracle‘,‘t001‘);
24 insert into course values (‘c005‘,‘SQL SERVER 2005‘,‘t003‘);
25 insert into course values (‘c006‘,‘C#‘,‘t003‘);
26 insert into course values (‘c007‘,‘JavaScript‘,‘t002‘);
27 insert into course values (‘c008‘,‘DIV+CSS‘,‘t001‘);
28 insert into course values (‘c009‘,‘PHP‘,‘t003‘);
29 insert into course values (‘c010‘,‘EJB3.0‘,‘t002‘);
30 commit;
31 /***************初始化成绩表***********************/
32 insert into sc values (‘s001‘,‘c001‘,78.9);
33 insert into sc values (‘s002‘,‘c001‘,80.9);
34 insert into sc values (‘s003‘,‘c001‘,81.9);
35 insert into sc values (‘s004‘,‘c001‘,60.9);
36 insert into sc values (‘s001‘,‘c002‘,82.9);
37 insert into sc values (‘s002‘,‘c002‘,72.9);
38 insert into sc values (‘s003‘,‘c002‘,81.9);
39 insert into sc values (‘s001‘,‘c003‘,‘59‘);
40 insert into sc values (‘s001‘,‘c007‘,‘90‘);
41 insert into sc values (‘s001‘,‘c010‘,‘90‘);
42 insert into sc values (‘s002‘,‘c007‘,72.9);
43 insert into sc values (‘s002‘,‘c010‘,72.9);
44 insert into sc values (‘s002‘,‘c003‘,72.9);
45 insert into sc values (‘s006‘,‘c003‘,76);
46 insert into sc values (‘s001‘,‘c005‘,‘58‘);
47 commit;

  1 --1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；
  2          select s1.sno 
  3          from sc s1 
  4               join sc s2 on s1.sno = s2.sno 
  5          where s1.cno = ‘c001‘ 
  6          and s2.cno=‘c002‘ 
  7          and s1.score>s2.score;
  8 
  9 --2、查询平均成绩大于60 分的同学的学号和平均成绩；
 10   select sno,avg(score) 
 11   from sc 
 12   group by sno 
 13   having avg(score)>60;
 14 
 15 --3、查询所有同学的学号、姓名、选课数、总成绩；
 16   select s2.sno,s1.sname,count(*),sum(score) 
 17   from student s1,sc s2 
 18   where s1.sno = s2.sno 
 19   group by s2.sno,s1.sname;
 20 
 21 --4、查询姓“刘”的老师的个数；
 22   select count(*) 
 23   from teacher 
 24   where tname like ‘刘%‘;
 25 
 26 --5、查询没学过“谌燕”老师课的同学的学号、姓名；
 27   select s1.sno,s1.sname 
 28   from student s1 
 29   where s1.sno not in (--得到学习这个老师课程的学生
 30       select distinct s2.sno 
 31       from sc s2 
 32       where s2.cno in (--得到这个老师的课程
 33             select c.cno 
 34             from course c 
 35             where c.tno = (--得到这个老师的tno
 36                   select tno 
 37                   from teacher 
 38                   where tname =‘谌燕‘)));
 39 
 40 --6、查询学过“c001”并且也学过编号“c002”课程的同学的学号、姓名；
 41   select s2.sno,s1.sname 
 42   from student s1,sc s2,sc s3 
 43   where s1.sno = s2.sno 
 44       and s2.cno = ‘c002‘ 
 45       and s2.sno = s3.sno 
 46       and s3.cno = ‘c001‘; 
 47 
 48 --7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；
 49   select s1.sno,s1.sname from student s1
 50   where not exists (
 51       select * 
 52       from (select cno from course--查询得到这个老师的所有课程
 53               where tno = (--查询得到这个老师的tno
 54                     select tno from teacher 
 55                     where tname = ‘谌燕‘)) c
 56       where not exists (
 57             select * from sc s2
 58             where s2.sno = s1.sno
 59             and s2.cno = c.cno))
 60 
 61 --8、查询课程编号“c002”的成绩比课程编号“c001”课程低的所有同学的学号、姓名；
 62   select sno,sname 
 63   from student 
 64   where sno in (
 65      select s1.sno 
 66      from sc s1,sc s2 
 67      where s1.sno= s2.sno 
 68      and s1.cno = ‘c001‘ 
 69      and s2.cno = ‘c002‘ 
 70      and s1.score>s2.score
 71   )
 72 
 73 --9、查询所有 课程成绩小于60 分的同学的学号、姓名；
 74   select sno,sname 
 75   from student 
 76   where sno in (
 77       select sno 
 78       from sc s2 
 79       where s2.score<60);
 80 /************第二种*******************/        
 81   select s2.sno,s1.sname---更优化
 82   from student s1 
 83      join sc s2 on s1.sno = s2.sno 
 84   where s2.score<60;
 85 
 86 --10、查询没有学全所有课的同学的学号、姓名；
 87   select sno,sname 
 88   from student 
 89   where sno not in (
 90       select sno 
 91       from sc 
 92       group by sno 
 93       having count(*) >= (
 94              select count(distinct cno) 
 95              from course)
 96   ) order by sno
 97 
 98 --11、查询至少有一门课与学号为“s001”的同学所学相同的同学的学号和姓名；
 99   select distinct s2.sno,s1.sname
100   from student s1 
101   join sc s2 
102   on s1.sno = s2.sno 
103   where s2.cno in (
104     select cno 
105     from sc 
106     where sno = ‘s001‘)
107 
108 --12、查询至少学过学号为“s001”同学所有一门课的其他同学学号和姓名；
109   select distinct s2.sno,s1.sname
110   from student s1 
111   join sc s2 
112   on s1.sno = s2.sno 
113   where s2.sno <> ‘s001‘ 
114   and s2.cno in (
115     select cno 
116     from sc 
117     where sno = ‘s001‘)
118 
119 --13、把“SC”表中“谌燕”老师教的课的成绩都更改为此课程的平均成绩；
120   update sc s1 
121   set score = (
122     select round(avg(s2.score),1) 
123     from sc s2 
124     where s2.cno = s1.cno)
125   where cno in (
126       select cno 
127       from course 
128       where tno = (
129             select tno 
130             from teacher 
131             where tname=‘谌燕‘));
132 
133 --14、查询和“s001”号的同学学习的课程完全相同的其他同学学号和姓名；
134   select s1.sno,s1.sname 
135   from student s1
136   where not exists(
137     select * 
138     from (select cno 
139           from sc 
140           where sno = ‘s001‘) c
141     where not exists(
142           select * 
143           from sc s2
144           where s1.sno = s2.sno
145           and s2.cno = c.cno
146           and s2.sno <> ‘s001‘
147     )
148   )
149 
150 --15、删除学习“谌燕”老师课的SC 表记录；
151   delete sc
152   where cno in (
153       select cno 
154       from course 
155       where tno = (
156             select tno 
157             from teacher 
158             where tname=‘谌燕‘));
159 
160 --16、向SC 表中 插入一些记录，这些记录要求符合以下条件：没有上过编号“c002”课程的同学学号、“c002”号课的平均成绩；
161   insert into sc (sno,cno,score)
162        select distinct st.sno,sc.cno,(
163                                       select avg(score) 
164                                       from sc 
165                                       where cno=‘c002‘)
166        from student st,sc
167        where not exists
168              (select * 
169              from sc 
170              where cno=‘c002‘ 
171              and sc.sno=st.sno) 
172       and sc.cno=‘c002‘;
173         
174   commit;
175 
176 --17、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分
177   select cno,max(score),min(score) 
178   from sc 
179   group by cno;
180 
181 --18、按各科平均成绩从低到高和及格率的百分数从高到低顺序
182   select cno,avg(score),
183        sum(case when score>=60 then 1 else 0 end)/count(*) as 及格率
184   from sc 
185   group by cno
186   order by avg(score) , 及格率 desc
187 
188 --19、查询不同老师所教不同课程平均分从高到低显示
189   select s.cno,avg(s.score) 
190   from course c 
191      join sc s on c.cno = s.cno 
192   group by c.tno,s.cno 
193   order by avg(score) desc--MY
194 /***********第二种**************/
195   select max(t.tno),max(t.tname),max(c.cno),max(c.cname),c.cno,avg(score) 
196   from sc , course c,teacher t
197   where sc.cno=c.cno and c.tno=t.tno
198   group by c.cno
199   order by avg(score) desc
200 
201 --20、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]
202   select s.cno,max(c.cname),
203        sum(case when s.score between 85 and 100 then 1 else 0 end) as "[100-85]",
204        sum(case when s.score between 70 and 84 then 1 else 0 end) as "[85-70]",
205        sum(case when s.score between 60 and 69 then 1 else 0 end) as "[70-60]",
206        sum(case when s.score <60 then 1 else 0 end) as "[ <60]"
207   from course c 
208      join sc s on s.cno = c.cno 
209   group by s.cno
210 
211 --21、查询各科成绩前三名的记录:(不考虑成绩并列情况)
212   select * from
213        (select sno,cno,score,row_number()over(partition by cno order by score desc) rn 
214        from sc)
215   where rn<4
216 
217 --22、查询每门课程被选修的学生数
218   select distinct c.cno,count(s.sno) --显示不出现sc表中的课程
219   from course c 
220      left join sc s on c.cno = s.cno 
221   group by c.cno;
222 
223   select cno,count(sno)
224   from sc 
225   group by cno;--只显示sc表中的课程
226 
227 --23、查询出只选修了一门课程的全部学生的学号和姓名
228   select sno,sname 
229   from student 
230   where sno in (
231       select s2.sno 
232       from sc s2 
233       group by s2.sno 
234       having count(s2.cno) = 1)
235 
236 --24、查询男生、女生人数
237   select ssex,count(*) 
238   from student 
239   group by ssex
240 
241 --25、查询姓“张”的学生名单
242   select * 
243   from student 
244   where sname like ‘张%‘
245 
246 --26、查询同名同姓学生名单，并统计同名人数
247   select sname,count(*) 
248   from student 
249   group by sname 
250   having count(*)>1
251 
252 --27、1995 年出生的学生名单(注：Student 表中Sage 列的类型是number)
253   select * 
254   from student 
255   where to_char(sysdate,‘yyyy‘)-sage = 1995--得到当前时间的年份，减去年龄等于1995
256 
257 --28、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列
258   select cno,round(avg(score),1) 
259   from sc 
260   group by cno 
261   order by avg(score),cno desc
262 
263 --29、查询平均成绩大于85 的所有学生的学号、姓名和平均成绩
264   select s2.sno,s1.sname,avg(s2.score)
265   from sc s2 
266        join student s1 on s1.sno = s2.sno
267   group by s1.sname,s2.sno
268   having avg(s2.score)>80
269 
270 --30、查询课程名称为“Oracle”，且分数低于60 的学生姓名和分数
271   select s1.sname,s2.score 
272   from student s1,sc s2,course c
273   where s1.sno = s2.sno
274   and s2.cno = c.cno 
275   and c.cname=‘Oracle‘ 
276   and s2.score<60
277 
278 --31、查询所有学生的选课情况；
279   select st.sno,st.sname,c.cname 
280   from student st,sc,course c
281   where sc.sno(+)=st.sno 
282   and sc.cno=c.cno(+);
283 
284 --32、查询任何一门课程成绩在70 分以上的姓名、课程名称和分数；
285   select st.sname,s.score,c.cname
286   from student st,sc s,course c
287   where st.sno = s.sno
288   and s.cno = c.cno
289   and s.score >70
290 
291 --33、查询不及格的课程，并按课程号从大到小排列
292   select * 
293   from sc
294   where score < 60
295   order by cno desc
296 
297 --34、查询课程编号为c001 且课程成绩在80 分以上的学生的学号和姓名；
298   select s.sno,st.sname,s.cno,s.score
299   from student st,sc s
300   where st.sno = s.sno
301   and s.cno = ‘c001‘
302   and s.score > 80
303 
304 --35、求选了课程的学生人数
305   select count(distinct sc.sno) 选课人数
306   from sc
307 
308 --36、查询选修“谌燕”老师所授课程的学生中，成绩最高的学生姓名及其成绩
309   select max(st.sname),max(s.score)------cost:10
310   from student st,sc s,course c,teacher t
311   where st.sno = s.sno
312   and s.cno = c.cno
313   and c.tno = t.tno
314   and t.tname = ‘谌燕‘;
315 /************第二种********************/
316   select max(st.sname),max(s.score)----cost:9
317   from student st 
318        join sc s using(sno)
319   where cno in (
320       select cno
321       from course
322       where tno = (
323             select tno
324             from teacher
325             where tname=‘谌燕‘));
326 
327 --37、查询各个课程及相应的选修人数
328   select cno,count(*)----sc表中的课程
329   from sc
330   group by cno
331   order by cno
332 /*******************************/  
333   select c.cno,count(s.sno)---course表中的课程
334   from sc s,course c
335   where s.cno(+) = c.cno
336   group by c.cno
337 
338 --38、查询不同课程成绩相同的学生的学号、课程号、学生成绩
339   select * from 
340   sc s1,sc s2 
341   where s1.score = s2.score 
342   and s1.cno <> s2.cno
343 
344 --39、查询每门功课成绩最好的前两名
345   select * 
346   from (select sno,cno,score,
347        row_number()over(partition by cno order by score desc) rn 
348        from sc) 
349   where rn <3  
350 
351 --40、统计每门课程的学生选修人数（超过10 人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列
352   select cno,count(sno)
353   from sc
354   group by cno
355   having count(sno) > 10
356   order by count(sno) desc,cno
357 
358 --41、检索至少选修两门课程的学生学号
359   select sno,count(cno)
360   from sc
361   group by sno
362   having count(cno) > 1
363 
364 --42、查询全部学生都选修的课程的课程号和课程
365   select cno,cname
366   from course
367   where cno in (--得到满足条件的课程号
368     select cno
369     from sc
370     group by cno
371     having count(sno) = (--如果这个课程的人数等于sc表中学生的人数，说明此课程满足条件
372                          select count(distinct sno)--得到sc表中学生的人数
373                          from sc))
374 
375 --43、查询没学过“谌燕”老师讲授的任一门课程的学生姓名           
376   select sname 
377   from student
378   where sno not in(--输出没有选修的学生
379         select distinct sc.sno--找到选修这个老师的学生
380         from sc,course c,teacher t
381         where sc.cno=c.cno 
382         and c.tno=t.tno 
383         and t.tname=‘谌燕‘
384   );
385 
386 --44、查询两门以上不及格课程的同学的学号及其平均成绩
387   select s1.sno,avg(s1.score) 
388   from sc s1
389   where (select count(*)--不及格课程的门数
390          from sc s2
391          where s2.sno = s1.sno
392          and s2.score < 60) >1--两门以上，包括2门
393   group by s1.sno
394 
395 --45、检索“c004”课程分数小于60，按分数降序排列的同学学号
396 select sno
397 from sc
398 where cno = ‘c004‘
399 and score < 60
400 order by score desc
401 
402 --46、删除“s002”同学的“c001”课程的成绩
403 delete sc
404        where sno = ‘s002‘
405        and cno = ‘c001‘