MySQL练习题及答案

Posted geng-xiaoqiaoliushui

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了MySQL练习题及答案相关的知识,希望对你有一定的参考价值。

复制于武沛齐老师

mysql测试题

一、表关系

请创建如下表,并创建相关约束

技术图片

二、操作表

1、自行创建测试数据

2、查询“生物”课程比“物理”课程成绩高的所有学生的学号;

3、查询平均成绩大于60分的同学的学号和平均成绩; 

4、查询所有同学的学号、姓名、选课数、总成绩;

5、查询姓“李”的老师的个数;

6、查询没学过“叶平”老师课的同学的学号、姓名;

7、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名;

8、查询学过“叶平”老师所教的所有课的同学的学号、姓名;

9、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;

10、查询有课程成绩小于60分的同学的学号、姓名;

11、查询没有学全所有课的同学的学号、姓名;

12、查询至少有一门课与学号为“001”的同学所学相同的同学的学号和姓名;

13、查询至少学过学号为“001”同学所选课程中任意一门课的其他同学学号和姓名;

14、查询和“002”号的同学学习的课程完全相同的其他同学学号和姓名;

15、删除学习“叶平”老师课的SC表记录;

16、向SC表中插入一些记录,这些记录要求符合以下条件:①没有上过编号“002”课程的同学学号;②插入“002”号课程的平均成绩; 

17、按平均成绩从低到高显示所有学生的“语文”、“数学”、“英语”三门的课程成绩,按如下形式显示: 学生ID,语文,数学,英语,有效课程数,有效平均分;

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;

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;

20、课程平均分从高到低显示(现实任课老师);

21、查询各科成绩前三名的记录:(不考虑成绩并列情况) 

22、查询每门课程被选修的学生数;

23、查询出只选修了一门课程的全部学生的学号和姓名;

24、查询男生、女生的人数;

25、查询姓“张”的学生名单;

26、查询同名同姓学生名单,并统计同名人数;

27、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;

28、查询平均成绩大于85的所有学生的学号、姓名和平均成绩;

29、查询课程名称为“数学”,且分数低于60的学生姓名和分数;

30、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; 

31、求选了课程的学生人数

32、查询选修“杨艳”老师所授课程的学生中,成绩最高的学生姓名及其成绩;

33、查询各个课程及相应的选修人数;

34、查询不同课程但成绩相同的学生的学号、课程号、学生成绩;

35、查询每门课程成绩最好的前两名;

36、检索至少选修两门课程的学生学号;

37、查询全部学生都选修的课程的课程号和课程名;

38、查询没学过“叶平”老师讲授的任一门课程的学生姓名;

39、查询两门以上不及格课程的同学的学号及其平均成绩;

40、检索“004”课程分数小于60,按分数降序排列的同学学号;

41、删除“002”同学的“001”课程的成绩;

 

 

MySQL练习题参考答案

 

导出现有数据库数据:

  • mysqldump -u用户名 -p密码 数据库名称 >导出文件路径           # 结构+数据
  • mysqldump -u用户名 -p密码 -d 数据库名称 >导出文件路径       # 结构 

导入现有数据库数据:

  • mysqldump -uroot -p密码  数据库名称 < 文件路径  
按 Ctrl+C 复制代码
按 Ctrl+C 复制代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
2、查询“生物”课程比“物理”课程成绩高的所有学生的学号;
思路:
    获取所有有生物课程的人(学号,成绩) - 临时表
    获取所有有物理课程的人(学号,成绩) - 临时表
    根据【学号】连接两个临时表:
        学号  物理成绩   生物成绩
 
    然后再进行筛选
 
        select A.student_id,sw,ty from
 
        (select student_id,num as sw from score left join course on score.course_id = course.cid where course.cname = ‘生物‘) as A
 
        left join
 
        (select student_id,num  as ty from score left join course on score.course_id = course.cid where course.cname = ‘体育‘) as B
 
        on A.student_id = B.student_id where sw > if(isnull(ty),0,ty);
 
3、查询平均成绩大于60分的同学的学号和平均成绩;
    思路:
        根据学生分组,使用avg获取平均值,通过havingavg进行筛选
 
        select student_id,avg(num) from score group by student_id having avg(num) > 60
 
4、查询所有同学的学号、姓名、选课数、总成绩;
 
    select score.student_id,sum(score.num),count(score.student_id),student.sname
    from
        score left join student on score.student_id = student.sid  
    group by score.student_id
 
5、查询姓“李”的老师的个数;
    select count(tid) from teacher where tname like ‘李%‘
 
    select count(1) from (select tid from teacher where tname like ‘李%‘) as B
 
6、查询没学过“叶平”老师课的同学的学号、姓名;
    思路:
        先查到“李平老师”老师教的所有课ID
        获取选过课的所有学生ID
        学生表中筛选
    select * from student where sid not in (
        select DISTINCT student_id from score where score.course_id in (
            select cid from course left join teacher on course.teacher_id = teacher.tid where tname = ‘李平老师‘
        )
    )
 
7、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名;
    思路:
        先查到既选择001又选择002课程的所有同学
        根据学生进行分组,如果学生数量等于2表示,两门均已选择
 
    select student_id,sname from
 
    (select student_id,course_id from score where course_id = 1 or course_id = 2) as B
      
    left join student on B.student_id = student.sid group by student_id HAVING count(student_id) > 1
 
 
8、查询学过“叶平”老师所教的所有课的同学的学号、姓名;
 
    同上,只不过将001和002变成 in (叶平老师的所有课)
 
9、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;
    同第1题
 
 
10、查询有课程成绩小于60分的同学的学号、姓名;
         
    select sid,sname from student where sid in (
        select distinct student_id from score where num < 60
    )
 
11、查询没有学全所有课的同学的学号、姓名;
    思路:
        在分数表中根据学生进行分组,获取每一个学生选课数量
        如果数量 == 总课程数量,表示已经选择了所有课程
 
        select student_id,sname
        from score left join student on score.student_id = student.sid
        group by student_id HAVING count(course_id) = (select count(1) from course)
 
 
12、查询至少有一门课与学号为“001”的同学所学相同的同学的学号和姓名;
    思路:
        获取 001 同学选择的所有课程
        获取课程在其中的所有人以及所有课程
        根据学生筛选,获取所有学生信息
        再与学生表连接,获取姓名
 
        select student_id,sname, count(course_id)
        from score left join student on score.student_id = student.sid
        where student_id != 1 and course_id in (select course_id from score where student_id = 1) group by student_id
 
13、查询至少学过学号为“001”同学所有课的其他同学学号和姓名;
        先找到和001的学过的所有人
        然后个数 = 001所有学科     ==》 其他人可能选择的更多
 
        select student_id,sname, count(course_id)
        from score left join student on score.student_id = student.sid
        where student_id != 1 and course_id in (select course_id from score where student_id = 1) group by student_id having count(course_id) = (select count(course_id) from score where student_id = 1)
 
14、查询和“002”号的同学学习的课程完全相同的其他同学学号和姓名;
         
        个数相同
        002学过的也学过
 
        select student_id,sname from score left join student on score.student_id = student.sid where student_id in (
            select student_id from score  where student_id != 1 group by student_id HAVING count(course_id) = (select count(1) from score where student_id = 1)
        ) and course_id in (select course_id from score where student_id = 1) group by student_id HAVING count(course_id) = (select count(1) from score where student_id = 1)
 
 
15、删除学习“叶平”老师课的score表记录;
 
    delete from score where course_id in (
        select cid from course left join teacher on course.teacher_id = teacher.tid where teacher.name = ‘叶平‘
    )
 
16、向SC表中插入一些记录,这些记录要求符合以下条件:①没有上过编号“002”课程的同学学号;②插入“002”号课程的平均成绩;
    思路:
        由于insert 支持 
                inset into tb1(xx,xx) select x1,x2 from tb2;
        所有,获取所有没上过002课的所有人,获取002的平均成绩
 
    insert into score(student_id, course_id, num) select sid,2,(select avg(num) from score where course_id = 2)
    from student where sid not in (
        select student_id from score where course_id = 2
    )
     
17、按平均成绩从低到高 显示所有学生的“语文”、“数学”、“英语”三门的课程成绩,按如下形式显示: 学生ID,语文,数学,英语,有效课程数,有效平均分;
    select sc.student_id,
        (select num from score left join course on score.course_id = course.cid where course.cname = "生物" and score.student_id=sc.student_id) as sy,
        (select num from score left join course on score.course_id = course.cid where course.cname = "物理" and score.student_id=sc.student_id) as wl,
        (select num from score left join course on score.course_id = course.cid where course.cname = "体育" and score.student_id=sc.student_id) as ty,
        count(sc.course_id),
        avg(sc.num)
    from score as sc
    group by student_id desc        
 
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;
     
    select course_id, max(num) as max_num, min(num) as min_num from score group by course_id;
 
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;
    思路:case when .. then
    select course_id, avg(num) as avgnum,sum(case when score.num > 60 then 1 else 0 END)/count(1)*100 as percent from score group by course_id order by avgnum asc,percent desc;
 
20、课程平均分从高到低显示(现实任课老师);
 
    select avg(if(isnull(score.num),0,score.num)),teacher.tname from course
    left join score on course.cid = score.course_id
    left join teacher on course.teacher_id = teacher.tid
 
    group by score.course_id
 
 
21、查询各科成绩前三名的记录:(不考虑成绩并列情况)
    select score.sid,score.course_id,score.num,T.first_num,T.second_num from score left join
    (
    select
        sid,
        (select num from score as s2 where s2.course_id = s1.course_id order by num desc limit 0,1) as first_num,
        (select num from score as s2 where s2.course_id = s1.course_id order by num desc limit 3,1) as second_num
    from
        score as s1
    ) as T
    on score.sid =T.sid
    where score.num <= T.first_num and score.num >= T.second_num
 
22、查询每门课程被选修的学生数;
     
    select course_id, count(1) from score group by course_id;
 
23、查询出只选修了一门课程的全部学生的学号和姓名;
    select student.sid, student.sname, count(1) from score
 
    left join student on score.student_id  = student.sid
 
     group by course_id having count(1) = 1
 
 
24、查询男生、女生的人数;
    select * from
    (select count(1) as man from student where gender=‘男‘) as A ,
    (select count(1) as feman from student where gender=‘女‘) as B
 
25、查询姓“张”的学生名单;
    select sname from student where sname like ‘张%‘;
 
26、查询同名同姓学生名单,并统计同名人数;
 
    select sname,count(1) as count from student group by sname;
 
27、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;
    select course_id,avg(if(isnull(num), 0 ,num)) as avg from score group by course_id order by avg     asc,course_id desc;
 
28、查询平均成绩大于85的所有学生的学号、姓名和平均成绩;
 
    select student_id,sname, avg(if(isnull(num), 0 ,num)) from score left join student on score.student_id = student.sid group by student_id;
 
29、查询课程名称为“数学”,且分数低于60的学生姓名和分数;
 
    select student.sname,score.num from score
    left join course on score.course_id = course.cid
    left join student on score.student_id = student.sid
    where score.num < 60 and course.cname = ‘生物‘
 
30、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;
    select * from score where score.student_id = 3 and score.num > 80
 
31、求选了课程的学生人数
 
    select count(distinct student_id) from score
 
    select count(c) from (
        select count(student_id) as c from score group by student_id) as A
 
32、查询选修“杨艳”老师所授课程的学生中,成绩最高的学生姓名及其成绩;
     
    select sname,num from score
    left join student on score.student_id = student.sid
    where score.course_id in (select course.cid from course left join teacher on course.teacher_id = teacher.tid where tname=‘张磊老师‘) order by num desc limit 1;
 
33、查询各个课程及相应的选修人数;
    select course.cname,count(1) from score
    left join course on score.course_id = course.cid
    group by course_id;
 
 
34、查询不同课程但成绩相同的学生的学号、课程号、学生成绩;
    select DISTINCT s1.course_id,s2.course_id,s1.num,s2.num from score as s1, score as s2 where s1.num = s2.num and s1.course_id != s2.course_id;
 
35、查询每门课程成绩最好的前两名;
 
    select score.sid,score.course_id,score.num,T.first_num,T.second_num from score left join
    (
    select
        sid,
        (select num from score as s2 where s2.course_id = s1.course_id order by num desc limit 0,1) as first_num,
        (select num from score as s2 where s2.course_id = s1.course_id order by num desc limit 1,1) as second_num
    from
        score as s1
    ) as T
    on score.sid =T.sid
    where score.num <= T.first_num and score.num >= T.second_num
 
36、检索至少选修两门课程的学生学号;
    select student_id from score group by student_id having count(student_id) > 1
 
37、查询全部学生都选修的课程的课程号和课程名;
    select course_id,count(1) from score group by course_id having count(1) = (select count(1) from student);
 
38、查询没学过“叶平”老师讲授的任一门课程的学生姓名;
    select student_id,student.sname from score
    left join student on score.student_id = student.sid
    where score.course_id not in (
        select cid from course left join teacher on course.teacher_id = teacher.tid where tname = ‘张磊老师‘
    )
    group by student_id
 
39、查询两门以上不及格课程的同学的学号及其平均成绩;
 
    select student_id,count(1) from score where num < 60 group by student_id having count(1) > 2
 
40、检索“004”课程分数小于60,按分数降序排列的同学学号;
    select student_id from score where num< 60 and course_id = 4 order by num desc;
 
41、删除“002”同学的“001”课程的成绩;
    delete from score where course_id = 1 and student_id = 2

以上是关于MySQL练习题及答案的主要内容,如果未能解决你的问题,请参考以下文章

MySQL练习题及答案

MySQL练习题及答案

MySQL的练习题及答案

mysql数据库的相关练习题及答案

MySQL习题及答案

七MySQL 多表查询详解(附练习题及答案----超详细)