Oracle SQL题目及其解答（学生、课程、成绩、教师）

不念不忘少年蓝@ 2022-05-21 09:14 149阅读 0赞

转载于：[/images/20220521/3c52fd6abf594399a6af8f712046d926.png][https_blog.csdn.net_tu451953337_article_details_45147757]

题目来源于http://blog.csdn.net/lifetragedy/article/details/9935699，由于原文题目中的数据在我自己建的DB里没有数据，所以解答中的条件可能是符合我DB的条件，而不是符合题目的条件。但解答应该符合题目的意思要求。但是文中的解答肯能会有错误，但都是经过我DB中实际跑过的。欢迎指出错误。

select \* from t\_student 学生表

![https_blog.csdn.net_tu451953337_article_details_45147757][]![Center][]

select \* from t\_course 课程表

![Center 1][]

select \* from t\_sc 学生成绩表

![Center 2][]

![https_blog.csdn.net_tu451953337_article_details_45147757][]

select \* from t\_teacher 老师表

![https_blog.csdn.net_tu451953337_article_details_45147757][]

![Center 3][]

1.  *--http://blog.csdn.net/lifetragedy/article/details/9935699*
2.  *--create table t\_student(stuid number(10,2) primary key,name varchar2(100), age number(3,0), sex char(1));*
3.  
4.  *--create table t\_course(cid number(10,2) primary key, name varchar2(100), teacherid number(10, 2));*
5.  *--alter table t\_course*
6.  *--add constraint tcourse\_fk foreign key (teacherid) references t\_teacher(tid);*
7.  
8.  *--create table t\_sc(stuid number(10, 2), cid number(10,2), score number(10,2));*
9.  *--alter table t\_sc* 
10. *--add constraint t\_sc\_pk primary key (stuid, cid);*
11. *--alter table t\_sc*
12. *--add constraint t\_sc\_stuid\_fk foreign key (stuid) references t\_student(stuid);*
13. *--alter table t\_sc*
14. *--add constraint t\_sc\_cid\_fk foreign key (cid) references t\_course(cid);*
15. 
16. *--create table t\_teacher(tid number(10,2) primary key, tname varchar2(100));*
17. */\**
18. *select \* from t\_student for update;*
19. *select \* from t\_course for update;*
20. *select \* from t\_sc for update;*
21. *select \* from t\_teacher for update;*
22. *\*/*
23. 
24. *--查询“1”课程比“2”课程成绩高的所有学生的学号*
25. select a.stuid
26. from ( select \* from t\_sc s where s.cid = 1) a,
27. ( select \* from t\_sc s where s.cid = 2) b
28. where a.stuid = b.stuid
29. and a.score > b.score;
30. */\**
31. *select a.S\#*
32.  *from (select s\#, score from SC where C\# = '001') a,*
33.  *(select s\#, score from SC where C\# = '002')*
34.  *where a.score > b.score*
35.  *and a.s\# = b.s\#;*
36. *\*/*
37. *--2、查询平均成绩大于80分的同学的学号和平均成绩；*
38. select stuid, avg(score) from t\_sc group by stuid having avg(score)> 80;
39. 
40. *--3、查询所有同学的学号、姓名、选课数、总成绩；*
41. select s.stuid, s.name, c.xks, c.zcj
42. from t\_student s left outer join
43. ( select stuid, count(cid) xks, sum(score) zcj
44. from t\_sc
45. group by stuid) c
46. on s.stuid = c.stuid;
47. 
48. select s.stuid, s.name, count(c.cid), sum(c.score)
49. from t\_student s
50. left Outer join t\_sc c
51. on s.stuid = c.stuid
52. group by s.stuid, s.name;
53. *--4、查询姓“李”的老师的个数；*
54. select count(tid) from t\_teacher where tname like '李%';
55. 
56. *--5、查询没学过“叶平”老师课的同学的学号、姓名；*
57. select s.stuid,s.name from t\_student s, t\_course c, t\_teacher t, t\_sc sc where s.stuid=sc.stuid and c.cid=sc.cid and c.teacherid=t.tid and t.tname!= '叶平';
58. 
59. select Student.S\#, Student.Sname
60. from Student
61. where S\# not in
62. ( select distinct (SC.S\#) from SC,
63. Course,
64. Teacher where SC.C\# = Course.C\# and Teacher.T\# = Course.T\# andTeacher.Tname = '叶平');
65. 
66. *--6、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名；*
67. select s.stuid,s.name from t\_student s, t\_sc c where c.cid= 1 and s.stuid=c.stuid and exists ( select \* from t\_sc sc where sc.stuid=s.stuid and sc.cid= 2);
68. 
69. *-- select Student.S\#,Student.Sname fromStudent,SC where Student.S\#=SC.S\# andSC.C\#='001'and exists( Select \* from SC as SC\_2 where SC\_2.S\#=SC.S\# and SC\_2.C\#='002');*
70. 
71. *--7、查询学过“叶平”老师所教的所有课的同学的学号、姓名；*
72. select s.stuid,s.name from t\_student s, t\_sc sc where s.stuid = sc.stuid and sc.cid in(
73. select c.cid from t\_teacher t, t\_course c where t.tid=c.teacherid and t.tname= 'Mr.kay');
74. 
75. select S\#, Sname
76. from Student
77. where S\# in
78. ( select S\#
79. from SC, Course, Teacher
80. where SC.C\# = Course.C\# andTeacher.T\# = Course.T\#
81. and Teacher.Tname = '叶平'
82. group by S\#
83. having count(SC.C\#) = ( select count(C\#) from Course,
84. Teacher where Teacher.T\# = Course.T\# and Tname = '叶平'));
85. 
86. *--8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名；*
87. Select S\#, Sname
88. from ( select Student.S\#,
89. Student.Sname,
90. score,
91. ( select score
92. from SC SC\_2
93. where SC\_2.S\# = Student.S\# and SC\_2.C\# = '002') score2
94. from Student, SC
95. where Student.S\# = SC.S\# andC\# = '001') S\_2
96. where score2 < score;
97. 
98. *--9、查询所有课程成绩小于60分的同学的学号、姓名；*
99. select s.stuid, s.name from t\_student s where s.stuid not in ( select sc.stuid from t\_student s, t\_sc sc where sc.score>= 60 and s.stuid=sc.stuid);
100. select s.stuid, s.name from t\_student s where not exists ( select \* from t\_sc sc where sc.stuid=s.stuid and sc.score>= 60);
101. 
102. *--10、查询没有学全所有课的同学的学号、姓名;*
103. select s.stuid, s.name from t\_student s,t\_sc sc where s.stuid=sc.stuid group by s.stuid,s.name having count(sc.cid) != ( select count(cid) from t\_course);
104. 
105. select Student.S\#, Student.Sname
106. from Student, SC whereStudent.S\# = SC.S\#
107. group by Student.S\#, Student.Sname
108. having count(C\#) < ( select count(C\#) from Course);
109. 
110. *--11、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名；*
111. select distinct s.stuid,s.name from t\_student s, t\_sc sc where s.stuid=sc.stuid and s.stuid!= 1 and sc.cid in ( select cid from t\_sc where stuid= 1)
112. *--select s.stuid,s.name from t\_Student s, t\_SC sc where s.stuid=SC.Stuid and sc.cid in (select Cid from t\_SC where stuid='1');*
113. 
114. *--13、把“t\_SC”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩；*
115. update t\_sc sc1 set sc1.score =
116. ( select avg(score) from t\_sc group by cid having cid in ( select cid from t\_teacher t, t\_course c where t.tid=c.teacherid and t.tname= 'Mr.mao') and cid=sc1.cid);
117. */\**
118. *update t\_sc sc\_1*
119.  *set sc\_1.score =*
120.  *(select avg(sc\_2.score) from t\_sc sc\_2 where sc\_2.cid = sc\_1.cid)*
121.  *from t\_course,*
122.  *t\_teacher*
123.  *where t\_course.Cid = t\_sc.cid and t\_course.tid = t\_teacher.tid*
124.  *and t\_teacher.tname = 'Mr.mao');*
125. *\*/*
126. select \* from t\_sc sc, t\_course c, t\_teacher t where sc.cid=c.cid and c.teacherid=t.tid and t.tname= 'Mr.mao'
127. 
128. 
129. *--14、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名；*
130. select \* from t\_sc where stuid in(
131. select stuid
132. from t\_sc
133. group by stuid
134. having count(\*) = ( select count(\*) from t\_sc where stuid = 6)
135. )
136. and cid in ( select cid from t\_sc where stuid= 6);
137. 
138. 
139. *--15、删除学习“叶平”老师课的SC表记录*
140. delete t\_sc where cid in(
141. select cid from t\_course c, t\_teacher t where c.teacherid=t.tid and t.tname= 'Mr.mao');
142. 
143. *--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“5”课程的同学学号、2号课的平均成绩；*
144. insert into t\_sc
145. select stuid, '5' cid, ( select avg(score) from t\_sc sc where sc.cid= 2) score
146. from t\_student s where not exists
147. ( select \* from t\_sc sc where sc.cid= 5 and sc.stuid=s.stuid);
148. 
149. *--17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩，按*
150. *--如下形式显示： 学生ID,,数据库,企业管理,英语,有效课程数,有效平均分*
151. 
152. select t.stuid,
153. max( case t.cname when 'Chinese' then t.score end) Chinese,
154. max( case t.cname when 'Math' then t.score end) Math,
155. max( case t.cname when 'English' then t.score end) English,
156. round( avg(t.score), 2) avgscore,
157. count(t.cid) kcs
158. from ( select s.stuid, s.name stuname, sc.cid, sc.score, c.name cname
159. from t\_student s, t\_sc sc, t\_course c
160. where s.stuid = sc.stuid
161. and sc.cid = c.cid
162. and c.name in ( 'Chinese', 'Math', 'English')) t
163. group by t.stuid
164. order by avgscore desc;
165. */\**
166. *select sc.stuid,*
167.  *(select score from t\_sc where cid=1 and stuid=sc.stuid) Chinese,*
168.  *(select score from t\_sc where cid=2 and stuid=sc.stuid) Math,*
169.  *(select score from t\_sc where cid=3 and stuid=sc.stuid) English,*
170.  *round(avg(sc.score),2) avgscore,*
171.  *count(c.cid) kcs*
172.  *from t\_sc sc, t\_course c where sc.cid=c.cid and c.name in ('Chinese', 'Math', 'English')*
173.  *group by sc.stuid*
174.  *order by avgscore desc;*
175. *\*/*
176. 
177. *--18、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*
178. select cid, max(score) maxscore, min(score) minscore from t\_sc group by cid order by cid;
179. */\**
180.  *SELECT L.Cid As 课程ID, L.score AS 最高分, R.score AS 最低分*
181.  *FROM t\_SC L, t\_SC R*
182.  *WHERE L.Cid = R.Cid*
183.  *and L.score = (SELECT MAX(IL.score)*
184.  *FROM t\_SC IL, t\_Student IM*
185.  *WHERE L.Cid = IL.Cid*
186.  *and IM.Stuid = IL.Stuid*
187.  *GROUP BY IL.Cid)*
188.  *AND R.Score =*
189.  *(SELECT MIN(IR.score) FROM t\_SC IR WHERE R.Cid = IR.Cid GROUP BY IR.Cid);*
190. *\*/*
191. 
192. 
193. *--19、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*
194. select sc.cid, ( select name from t\_course where cid=sc.cid) cname,
195. round( avg(sc.score), 2) avgscore,
196. round(( select count(\*) from t\_sc where cid = sc.cid and score>= 70)/
197. ( select count(\*) from t\_sc where cid = sc.cid)\* 100, 2)|| '%' jgl
198. from t\_sc sc
199. group by sc.cid
200. order by avgscore, jgl desc;
201. */\**
202.  *SELECT t.C\# AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS平均成绩*
203.  *,100 \* SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(\*) AS 及格百分数*
204.  *FROM SC T,Course*
205.  *where t.C\#=course.C\#*
206.  *GROUP BY t.C\#*
207.  *ORDER BY 100\* SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(\*) DESC*
208.  *\*/*
209. 
210. *--20、查询如下课程平均成绩和及格率的百分数(用"1行"显示):* 
211. *--企业管理（001），马克思（002），OO&UML （003），数据库（004）* 
212. select \* from t\_sc sc group by sc.cid
213. 
214. select sc.cid, ( select name from t\_course where cid=sc.cid) cname,
215. case sc.cid when 1 then round( avg(sc.score), 2) end chinese\_avgscore,
216. case sc.cid when 1 then
217. round(( select count(\*) from t\_sc where cid = sc.cid and score>= 70)/
218. ( select count(\*) from t\_sc where cid = sc.cid)\* 100, 2)|| '%' end chinese\_jgl
219. from t\_sc sc
220. group by sc.cid
221. 
222. 
223. *--21、查询不同老师所教不同课程平均分从高到低显示*
224. select sc.cid,
225. round( avg(sc.score), 2) avg\_score,
226. c.name,
227. t.tname
228. from t\_sc sc, t\_course c, t\_teacher t
229. where sc.cid=c.cid and t.tid=c.teacherid
230. group by sc.cid, c.name, t.tname
231. order by avg\_score desc;
232. 
233. *--22、查询如下语文成绩第 2 名到第 5 名的学生成绩单：*
234. *--\[学生ID\],\[学生姓名\],语文成绩， 排名*
235. select \* from (
236. select t.\*, rownum tn from (
237. select s.stuid, s.name,
238. min( case c.name when 'Chinese' then sc.score end) chinese\_score
239. from t\_student s, t\_sc sc, t\_course c
240. where s.stuid = sc.stuid
241. and sc.cid = c.cid
242. group by s.stuid, s.name
243. order by chinese\_score desc) t where rownum <= 5) where tn> 1
244. 
245. *--23、统计列印各科成绩,各分数段人数:课程ID,课程名称,\[100-85\],\[85-70\],\[70-60\],\[ <60\]* 
246. 
247. select sc.cid, c.name,
248. ( select count(\*) from t\_sc where cid=sc.cid and score>= 85 and score<= 100) a,
249. ( select count(\*) from t\_sc where cid=sc.cid and score>= 70 and score< 85) b,
250. ( select count(\*) from t\_sc where cid=sc.cid and score>= 60 and score< 70) c,
251. ( select count(\*) from t\_sc where cid=sc.cid and score< 60) d
252. from t\_sc sc, t\_course c
253. where sc.cid = c.cid
254. group by sc.cid, c.name;
255. */\**
256.  *SELECT SC.Cid as 课程ID, c.name as 课程名称* 
257.  *,SUM(CASE WHEN sc.score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS a*
258.  *,SUM(CASE WHEN sc.score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS b*
259.  *,SUM(CASE WHEN sc.score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS c*
260.  *,SUM(CASE WHEN sc.score < 60 THEN 1 ELSE 0 END) AS d*
261.  *FROM t\_SC sc,t\_Course c*
262.  *where SC.Cid=C.Cid* 
263.  *GROUP BY SC.Cid,c.name;* 
264. *\*/*
265. 
266. *--24、查询学生平均成绩及其名次* 
267. select t.\*, rownum rn from (
268. select s.stuid, s.name, avg(sc.score) avg\_score from t\_student s, t\_sc sc where s.stuid=sc.stuid
269. group by s.stuid, s.name
270. order by avg\_score desc) t;
271. 
272. select t.\*, row\_number() over( order by avg\_score desc) pm from (
273. select s.stuid, s.name, avg(sc.score) avg\_score
274. from t\_student s, t\_sc sc where s.stuid=sc.stuid
275. group by s.stuid, s.name
276. ) t;
277. 
278. *--25、查询各科成绩前三名的记录:(不考虑成绩并列情况)* 
279. select \* from (
280. select sc.cid, c.name, sc.score, row\_number() over( partition by sc.cid,c.name order by sc.score desc) pm
281. from t\_sc sc, t\_course c where sc.cid=c.cid ) where pm <= 3;
282. 
283. */\**
284. *SELECT t1.S\# as 学生ID,t1.C\# as 课程ID,Score as 分数* 
285.  *FROM SC t1* 
286.  *WHERE score IN (SELECT TOP 3 score* 
287.  *FROM SC* 
288.  *WHERE t1.C\#= C\#* 
289.  *ORDER BY score DESC* 
290.  *)* 
291.  *ORDER BY t1.C\#;* 
292. *\*/*
293. 
294. *--26、查询每门课程被选修的学生数* 
295. select cid, count(\*) rs, ( select name from t\_course where cid=t\_sc.cid) cname from t\_sc group by cid;
296. 
297. *--27、查询出只选修了3门课程的全部学生的学号和姓名* 
298. select sc.stuid, s.name from t\_sc sc, t\_student s where sc.stuid = s.stuid group by sc.stuid,s.name having count(\*) = 3;
299. 
300. 
301. *--28、查询男生、女生人数*
302. select case when sex= '1' then 'Man' else 'Woman' end sex, count(\*) rs from t\_student group by sex;
303. 
304. *--29、查询姓“张”的学生名单* 
305. select \* from t\_student where name like 'w%';
306. 
307. *--30、查询同名同性学生名单，并统计同名人数* 
308. select name, count(\*) rs from t\_student group by name having count(\*)> 1;
309. 
310. *--31、1981年出生的学生名单(注：Student表中Sage列的类型是datetime)* 
311. select to\_char( sysdate, 'yyyy') year from dual;
312. 
313. *--32、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* 
314. select cid, round( avg(score), 2) avg\_score from t\_sc group by cid order by avg\_score, cid desc;
315. 
316. *--33、查询平均成绩大于85的所有学生的学号、姓名和平均成绩* 
317. select s.stuid, s.name, round( avg(sc.score), 2) avg\_score from t\_student s, t\_sc sc where s.stuid=sc.stuid group by s.stuid, s.name having avg(sc.score)> 80;
318. 
319. *--34、查询课程名称为“数据库”，且分数低于60的学生姓名和分数* 
320. select s.stuid, s.name stuname, sc.score from t\_student s, t\_sc sc, t\_course c where s.stuid=sc.stuid and sc.cid=c.cid and c.name= 'Computer' and sc.score< 70;
321. 
322. *--35、查询所有学生的选课情况*
323. select s.stuid, s.name stuname, c.cid, c.name coursename from t\_student s, t\_sc sc, t\_course c where s.stuid=sc.stuid and sc.cid=c.cid;
324. 
325. *--36、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*
326. select s.stuid, s.name stuname, c.cid, c.name coursename, sc.score from t\_student s, t\_sc sc, t\_course c where s.stuid=sc.stuid and sc.cid=c.cid and sc.score> 70;
327. 
328. *--37、查询不及格的课程，并按课程号从大到小排列* 
329. select c.cid, c.name from t\_sc sc, t\_course c where sc.cid=c.cid group by c.cid,c.name,sc.score having sc.score< 70 order by c.cid desc;
330. 
331. *--38、查询课程编号为003且课程成绩在80分以上的学生的学号和姓名；* 
332. select s.stuid, s.name, sc.score from t\_student s,t\_sc sc where s.stuid=sc.stuid and sc.cid= 3 and sc.score> 80;
333. 
334. *--39、求选了课程的学生人数*
335. select count(\*) rs from ( select stuid from t\_sc group by stuid);
336. 
337. *--40、查询选修“叶平”老师所授课程的学生中，成绩最高的学生姓名及其成绩* 
338. select s.stuid, s.name stuname, t.max\_score from t\_student s, t\_sc sc,
339. ( select c.cid, max(sc.score) max\_score from t\_sc sc, t\_course c, t\_teacher t where sc.cid=c.cid and c.teacherid=t.tid
340. and t.tname= 'Mr.mao' group by c.cid) t
341. where s.stuid=sc.stuid and sc.cid=t.cid and sc.score=t.max\_score;
342. */\**
343. *select S.name stuname, sc.score*
344.  *from t\_Student s, t\_SC sc, t\_Course C, t\_Teacher t*
345.  *where S.Stuid = SC.Stuid*
346.  *and SC.Cid = C.Cid*
347.  *and C.Teacherid = T.tid*
348.  *and T.Tname = 'Mr.mao'*
349.  *and SC.score = (select max(score) from t\_SC where Cid = C.Cid);\*/*
350. 
351. *--41、查询各个课程及相应的选修人数*
352. select cid, count(\*) rs from t\_sc group by cid order by cid;
353. 
354. *--42、查询不同课程成绩相同的学生的学号、课程号、学生成绩* 
355. select \* from t\_sc sc where exists ( select \* from t\_sc where stuid!=sc.stuid and cid!=sc.cid and score=sc.score);
356. select distinct A.Stuid,B.score from t\_SC A ,t\_SC B where A.Score=B.Score and A.Cid <>B.Cid ;
357. 
358. *--43、查询每门功成绩最好的前两名* 
359. select \* from ( select stuid, cid ,score, row\_number() over( partition by cid order by score desc) pm from t\_sc) where pm< 3;
360. */\**
361.  *SELECT t1.S\# as 学生ID, t1.C\# as 课程ID, Score as 分数*
362.  *FROM SC t1*
363.  *WHERE score IN*
364.  *(SELECT TOP 2 score FROM SC WHERE t1.C\# = C\# ORDER BY score DESC)*
365.  *ORDER BY t1.C\#;*
366. *\*/*
367. 
368. *--44、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，*
369. *--查询结果按人数降序排列，查询结果按人数降序排列，若人数相同，按课程号升序排列* 
370. select cid, count(\*) rs from t\_sc group by cid having count(\*) > 5 order by rs desc, cid;
371. 
372. *--45、检索至少选修两门课程的学生学号* 
373. select stuid , count(\*) from t\_sc group by stuid having count(\*) > 2;
374. 
375. 
376. *--46、查询全部学生都选修的课程的课程号和课程名* 
377. select c.cid, c.name from t\_course c where exists (
378. select cid, count(\*) rs from t\_sc where cid=c.cid group by cid having count(\*) = ( select count(\*) from t\_student)
379. );
380. 
381. *--47、查询没学过“叶平”老师讲授的任一门课程的学生姓名* 
382. select \* from t\_student where stuid not in(
383. select s.stuid from t\_student s, t\_sc sc where s.stuid=sc.stuid and sc.cid in ( select cid from t\_course c, t\_teacher t where c.teacherid=t.tid and t.tname= 'Mr.zhu'));
384. 
385. select \* from t\_Student s where s.stuid not in ( select sc.stuid from t\_Course c,t\_Teacher t,t\_SC sc where c.teacherid=T.Tid and SC.Cid=c.Cid and t.Tname= 'Mr.zhu');
386. 
387. 
388. *--48、查询1门以上不及格课程的同学的学号及其平均成绩* 
389. select stuid, avg(score) avg\_score from t\_sc group by stuid having stuid in(
390. select stuid from t\_sc where score< 70 group by stuid having count(\*) > 1);
391. 
392. select S\#, avg( isnull(score, 0)) from SC where S\# in ( select S\# from SC where score < 60 group by S\# having count(\*)> 1) group by S\#;
393. 
394. *--49、检索“5”课程分数小于60，按分数降序排列的同学学号* 
395. select stuid from t\_sc where cid= 5 and score< 70 order by score desc;
396. 
397. *--50、删除“002”同学的“001”课程的成绩*
398. delete from t\_sc where stuid= 2 and cid= 1;
399. 
400. 
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