sql查询实例1（学⽣表_课程表_成绩表_教师表）表架构
Student(S#,Sname,Sage,Ssex) 学⽣表
Course(C#,Cname,T#) 课程表
SC(S#,C#,score) 成绩表
Teacher(T#,Tname) 教师表
建表语句
1CREATE TABLE student
2 (
3 s# INT,
4 sname nvarchar(32),
5 sage INT,
6 ssex nvarchar(8)
7 )
8
9CREATE TABLE course
10 (
11 c# INT,
12 cname nvarchar(32),
13 t# INT
14 )
15
16CREATE TABLE sc
17 (
18 s# INT,
19 c# INT,
20 score INT
21 )
22
23CREATE TABLE teacher
24 (
25 t# INT,
26 tname nvarchar(16)
27 )
插⼊测试数据语句
1insert into Student select 1,N'刘⼀',18,N'男' union all
2 select 2,N'钱⼆',19,N'⼥' union all
3 select 3,N'张三',17,N'男' union all
4 select 4,N'李四',18,N'⼥' union all
5 select 5,N'王五',17,N'男' union all
6 select 6,N'赵六',19,N'⼥'
7
8 insert into Teacher select 1,N'叶平' union all
9 select 2,N'贺⾼' union all
10 select 3,N'杨艳' union all
11 select 4,N'周磊'
12
13 insert into Course select 1,N'语⽂',1 union all
14 select 2,N'数学',2 union all
15 select 3,N'英语',3 union all
16 select 4,N'物理',4sql查询语句实例大全
17
18 insert into SC
19 select 1,1,56 union all
20 select 1,2,78 union all
21 select 1,3,67 union all
22 select 1,4,58 union all
23 select 2,1,79 union all
24 select 2,2,81 union all
25 select 2,3,92 union all
26 select 2,4,68 union all
27 select 3,1,91 union all
28 select 3,2,47 union all
29 select 3,3,88 union all
30 select 3,4,56 union all
31 select 4,2,88 union all
32 select 4,3,90 union all
33 select 4,4,93 union all
34 select 5,1,46 union all
35 select 5,3,78 union all
36 select 5,4,53 union all
37 select 6,1,35 union all
38 select 6,2,68 union all
39 select 6,4,71
问题
1问题：
21、查询“001”课程⽐“002”课程成绩⾼的所有学⽣的学号；
3 select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
4 from SC where C#='002') b
5 where a.score>b.score and a.s#=b.s#;
62、查询平均成绩⼤于60分的同学的学号和平均成绩；
7 select S#,avg(score)
8 from sc
9 group by S# having avg(score) >60;
103、查询所有同学的学号、姓名、选课数、总成绩；
11 select Student.S#,Student.Sname,count(SC.C#),sum(score)
12 from Student left Outer join SC on Student.S#=SC.S#
13 group by Student.S#,Sname
144、查询姓“李”的⽼师的个数；
15 select count(distinct(Tname))
16 from Teacher
17 where Tname like '李%';
185、查询没学过“叶平”⽼师课的同学的学号、姓名；
19 select Student.S#,Student.Sname
20 from Student
21 where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平'
21 where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平' 226、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名；
23 select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#='001'a
nd exists( Select * from SC as SC_2 where SC_2.S# 247、查询学过“叶平”⽼师所教的所有课的同学的学号、姓名；
25 select S#,Sname
26 from Student
27 where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平' group by S#
288、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；
29 Select S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2
30 from Student,SC where Student.S#=SC.S# and C#='001') S_2 where score2 <score;
319、查询所有课程成绩⼩于60分的同学的学号、姓名；
32 select S#,Sname
33 from Student
34 where S# not in (select S.S# from Student AS S,SC where S.S#=SC.S# and score>60);
3510、查询没有学全所有课的同学的学号、姓名；
36 select Student.S#,Student.Sname
37 from Student,SC
38 where Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) <(select count(C#) from Course);
3911、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；
40 select distinct S#,Sname from Student,SC where Student.S#=SC.S# and SC.C# in (select C# from SC where S#='1001');
4112、查询⾄少学过学号为“001”同学所有⼀门课的其他同学学号和姓名；
42 select distinct SC.S#,Sname
43 from Student,SC
44 where Student.S#=SC.S# and C# in (select C# from SC where S#='001');
4513、把“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；
46 update SC set score=(select avg(SC_2.score)
47 from SC SC_2
48 where SC_2.C#=SC.C# ) from Course,Teacher where Course.C#=SC.C# and Course.T#=Teacher.T# and Teacher.Tname='叶平');
4914、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；
50 select S# from SC where C# in (select C# from SC where S#='1002')
51 group by S# having count(*)=(select count(*) from SC where S#='1002');
5215、删除学习“叶平”⽼师课的SC表记录；
53 Delect SC
54 from course ,Teacher
55 where Course.C#=SC.C# and Course.T#= Teacher.T# and Tname='叶平';
5616、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“003”课程的同学学号、2、
57号课的平均成绩；
58 Insert SC select S#,'002',(Select avg(score)
59 from SC where C#='002') from Student where S# not in (Select S# from SC where C#='002');
6017、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
61 SELECT S# as 学⽣ID
62 ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 数据库
63 ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企业管理
64 ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英语
65 ,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩
66 FROM SC AS t
67 GROUP BY S#
68 ORDER BY avg(t.score)
6918、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
70 SELECT L.C# As 课程ID,L.score AS 最⾼分,R.score AS 最低分
71 FROM SC L ,SC AS R
72 WHERE L.C# = R.C# and
73 L.score = (SELECT MAX(IL.score)
74 FROM SC AS IL,Student AS IM
75 WHERE L.C# = IL.C# and IM.S#=IL.S#
76 GROUP BY IL.C#)
77 AND
78 R.Score = (SELECT MIN(IR.score)
79 FROM SC AS IR
80 WHERE R.C# = IR.C#
81 GROUP BY IR.C#
82 );
83⾃⼰写的:select c# ,max(score)as 最⾼分 ,min(score) as 最低分 from dbo.sc group by c#
8419、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
85 SELECT t.C# AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS 平均成绩
86 ,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数
86 ,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数
87 FROM SC T,Course
88 where t.C#=course.C#
89 GROUP BY t.C#
90 ORDER BY 100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC
9120、查询如下课程平均成绩和及格率的百分数(⽤"1⾏"显⽰): 企业管理（001），马克思（002），OO&UML （003），数据库（004）
92 SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企业管理平均分
93 ,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企业管理及格百分
94 ,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 马克思平均分
95 ,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 马克思及格百分数
96 ,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分
97 ,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分数
98 ,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 数据库平均分
99 ,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 数据库及格百分数100 FROM SC
10121、查询不同⽼师所教不同课程平均分从⾼到低显⽰
102 SELECT max(Z.T#) AS 教师ID,MAX(Z.Tname) AS 教师姓名,C.C# AS 课程ＩＤ,MAX(C.Cname) AS 课程名称,AVG(Score) AS 平均成绩
103 FROM SC AS T,Course AS C ,Teacher AS Z
104 where T.C#=C.C# and C.T#=Z.T#
105 GROUP BY C.C#
106 ORDER BY AVG(Score) DESC
10722、查询如下课程成绩第 3 名到第 6 名的学⽣成绩单：企业管理（001），马克思（002），UML （003），数据库（004）
108 [学⽣ID],[学⽣姓名]，企业管理，马克思,UML，数据库，平均成绩
109 SELECT DISTINCT top 3
110 SC.S# As 学⽣学号,
111 Student.Sname AS 学⽣姓名 ,
112 T1.score AS 企业管理,
113 T2.score AS 马克思,
114 T3.score AS UML,
115 T4.score AS 数据库,
116 ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分
117 FROM Student,SC LEFT JOIN SC AS T1
118 ON SC.S# = T1.S# AND T1.C# = '001'
119 LEFT JOIN SC AS T2
120 ON SC.S# = T2.S# AND T2.C# = '002'
121 LEFT JOIN SC AS T3
122 ON SC.S# = T3.S# AND T3.C# = '003'
123 LEFT JOIN SC AS T4
124 ON SC.S# = T4.S# AND T4.C# = '004'
125 WHERE student.S#=SC.S# and
126 ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
127 NOT IN
128 (SELECT
129 DISTINCT
130 TOP 15 WITH TIES
131 ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
132 FROM sc
133 LEFT JOIN sc AS T1
134 ON sc.S# = T1.S# AND T1.C# = 'k1'
135 LEFT JOIN sc AS T2
136 ON sc.S# = T2.S# AND T2.C# = 'k2'
137 LEFT JOIN sc AS T3
138 ON sc.S# = T3.S# AND T3.C# = 'k3'
139 LEFT JOIN sc AS T4
140 ON sc.S# = T4.S# AND T4.C# = 'k4'
141 ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);
142
14323、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]
144 SELECT SC.C# as 课程ID, Cname as 课程名称
145 ,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85]
146 ,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70]
147 ,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60]
148 ,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -]
149 FROM SC,Course
150 where SC.C#=Course.C#
151 GROUP BY SC.C#,Cname;
151 GROUP BY SC.C#,Cname;
152
15324、查询学⽣平均成绩及其名次
154 SELECT 1+(SELECT COUNT( distinct 平均成绩)
155 FROM (SELECT S#,AVG(score) AS 平均成绩
156 FROM SC
157 GROUP BY S#
158 ) AS T1
159 WHERE 平均成绩 > T2.平均成绩) as 名次,
160 S# as 学⽣学号，平均成绩
161 FROM (SELECT S#,AVG(score) 平均成绩
162 FROM SC
163 GROUP BY S#
164 ) AS T2
165 ORDER BY 平均成绩 desc;
166
16725、查询各科成绩前三名的记录:(不考虑成绩并列情况)
168 SELECT t1.S# as 学⽣ID,t1.C# as 课程ID,Score as 分数
169 FROM SC t1
170 WHERE score IN (SELECT TOP 3 score
171 FROM SC
172 WHERE t1.C#= C#
173 ORDER BY score DESC
174 )
175 ORDER BY t1.C#;
17626、查询每门课程被选修的学⽣数
177 select c#,count(S#) from sc group by C#;
17827、查询出只选修了⼀门课程的全部学⽣的学号和姓名
179 select SC.S#,Student.Sname,count(C#) AS 选课数
180 from SC ,Student
181 where SC.S#=Student.S# group by SC.S# ,Student.Sname having count(C#)=1;
18228、查询男⽣、⼥⽣⼈数
183 Select count(Ssex) as 男⽣⼈数 from Student group by Ssex having Ssex='男';
184 Select count(Ssex) as ⼥⽣⼈数 from Student group by Ssex having Ssex='⼥'；
18529、查询姓“张”的学⽣名单
186 SELECT Sname FROM Student WHERE Sname like '张%';
18730、查询同名同性学⽣名单，并统计同名⼈数
188 select Sname,count(*) from Student group by Sname having count(*)>1;;
18931、1981年出⽣的学⽣名单(注：Student表中Sage列的类型是datetime)
190 select Sname, CONVERT(char (11),DATEPART(year,Sage)) as age
191 from student
192 where CONVERT(char(11),DATEPART(year,Sage))='1981';
19332、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
194 Select C#,Avg(score) from SC group by C# order by Avg(score),C# DESC ;
19533、查询平均成绩⼤于85的所有学⽣的学号、姓名和平均成绩
196 select Sname,SC.S# ,avg(score)
197 from Student,SC
198 where Student.S#=SC.S# group by SC.S#,Sname having avg(score)>85;
19934、查询课程名称为“数据库”，且分数低于60的学⽣姓名和分数
200 Select Sname,isnull(score,0)
201 from Student,SC,Course
202 where SC.S#=Student.S# and SC.C#=Course.C# and Course.Cname='数据库'and score <60; 20335、查询所有学⽣的选课情况；
204 SELECT SC.S#,SC.C#,Sname,Cname
205 FROM SC,Student,Course
206 where SC.S#=Student.S# and SC.C#=Course.C# ;
20736、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；
208 SELECT distinct student.S#,student.Sname,SC.C#,SC.score
209 FROM student,Sc
210 WHERE SC.score>=70 AND SC.S#=student.S#;
21137、查询不及格的课程，并按课程号从⼤到⼩排列
212 select c# from sc where scor e <60 order by C# ;
21338、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；
214 select SC.S#,Student.Sname from SC,Student where SC.S#=Student.S# and Score>80 and C#='003'; 21539、求选了课程的学⽣⼈数
216 select count(*) from sc;
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