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SQL经典练习题

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SQL经典练习题

表名和字段

–1.学生表 
Student(s_id,s_name,s_birth,s_sex) –学生编号,学生姓名, 出生年月,学生性别 
–2.课程表 
Course(c_id,c_name,t_id) – –课程编号, 课程名称, 教师编号 
–3.教师表 
Teacher(t_id,t_name) –教师编号,教师姓名 
–4.成绩表 
Score(s_id,c_id,s_score) –学生编号,课程编号,分数

测试数据

--建表
--学生表
CREATE TABLE `Student`(
    `s_id` VARCHAR(20),
    `s_name` VARCHAR(20) NOT NULL DEFAULT ‘‘,
    `s_birth` VARCHAR(20) NOT NULL DEFAULT ‘‘,
    `s_sex` VARCHAR(10) NOT NULL DEFAULT ‘‘,
    PRIMARY KEY(`s_id`)
);
--课程表
CREATE TABLE `Course`(
    `c_id`  VARCHAR(20),
    `c_name` VARCHAR(20) NOT NULL DEFAULT ‘‘,
    `t_id` VARCHAR(20) NOT NULL,
    PRIMARY KEY(`c_id`)
);
--教师表
CREATE TABLE `Teacher`(
    `t_id` VARCHAR(20),
    `t_name` VARCHAR(20) NOT NULL DEFAULT ‘‘,
    PRIMARY KEY(`t_id`)
);
--成绩表
CREATE TABLE `Score`(
    `s_id` VARCHAR(20),
    `c_id`  VARCHAR(20),
    `s_score` INT(3),
    PRIMARY KEY(`s_id`,`c_id`)
);
--插入学生表测试数据
insert into Student values(‘01‘ , ‘赵雷‘ , ‘1990-01-01‘ , ‘男‘);
insert into Student values(‘02‘ , ‘钱电‘ , ‘1990-12-21‘ , ‘男‘);
insert into Student values(‘03‘ , ‘孙风‘ , ‘1990-05-20‘ , ‘男‘);
insert into Student values(‘04‘ , ‘李云‘ , ‘1990-08-06‘ , ‘男‘);
insert into Student values(‘05‘ , ‘周梅‘ , ‘1991-12-01‘ , ‘女‘);
insert into Student values(‘06‘ , ‘吴兰‘ , ‘1992-03-01‘ , ‘女‘);
insert into Student values(‘07‘ , ‘郑竹‘ , ‘1989-07-01‘ , ‘女‘);
insert into Student values(‘08‘ , ‘王菊‘ , ‘1990-01-20‘ , ‘女‘);
--课程表测试数据
insert into Course values(‘01‘ , ‘语文‘ , ‘02‘);
insert into Course values(‘02‘ , ‘数学‘ , ‘01‘);
insert into Course values(‘03‘ , ‘英语‘ , ‘03‘);

--教师表测试数据
insert into Teacher values(‘01‘ , ‘张三‘);
insert into Teacher values(‘02‘ , ‘李四‘);
insert into Teacher values(‘03‘ , ‘王五‘);

--成绩表测试数据
insert into Score values(‘01‘ , ‘01‘ , 80);
insert into Score values(‘01‘ , ‘02‘ , 90);
insert into Score values(‘01‘ , ‘03‘ , 99);
insert into Score values(‘02‘ , ‘01‘ , 70);
insert into Score values(‘02‘ , ‘02‘ , 60);
insert into Score values(‘02‘ , ‘03‘ , 80);
insert into Score values(‘03‘ , ‘01‘ , 80);
insert into Score values(‘03‘ , ‘02‘ , 80);
insert into Score values(‘03‘ , ‘03‘ , 80);
insert into Score values(‘04‘ , ‘01‘ , 50);
insert into Score values(‘04‘ , ‘02‘ , 30);
insert into Score values(‘04‘ , ‘03‘ , 20);
insert into Score values(‘05‘ , ‘01‘ , 76);
insert into Score values(‘05‘ , ‘02‘ , 87);
insert into Score values(‘06‘ , ‘01‘ , 31);
insert into Score values(‘06‘ , ‘03‘ , 34);
insert into Score values(‘07‘ , ‘02‘ , 89);
insert into Score values(‘07‘ , ‘03‘ , 98);习题和sql语句
-- 1、查询"01"课程比"02"课程成绩高的学生的信息及课程分数  

select a.* ,b.s_score as 01_score,c.s_score as 02_score from 
    student a 
    join score b on a.s_id=b.s_id and b.c_id=‘01‘
    left join score c on a.s_id=c.s_id and c.c_id=‘02‘ or c.c_id = NULL where b.s_score>c.s_score


-- 2、查询"01"课程比"02"课程成绩低的学生的信息及课程分数

select a.* ,b.s_score as 01_score,c.s_score as 02_score from 
    student a left join score b on a.s_id=b.s_id and b.c_id=‘01‘ or b.c_id=NULL 
     join score c on a.s_id=c.s_id and c.c_id=‘02‘ where b.s_score<c.s_score


-- 3、查询平均成绩大于等于60分的同学的学生编号和学生姓名和平均成绩
select b.s_id,b.s_name,ROUND(AVG(a.s_score),2) as avg_score from 
    student b 
    join score a on b.s_id = a.s_id
    GROUP BY b.s_id,b.s_name HAVING ROUND(AVG(a.s_score),2)>=60;


-- 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
        -- (包括有成绩的和无成绩的)

select b.s_id,b.s_name,ROUND(AVG(a.s_score),2) as avg_score from 
    student b 
    left join score a on b.s_id = a.s_id
    GROUP BY b.s_id,b.s_name HAVING ROUND(AVG(a.s_score),2)<60
    union
select a.s_id,a.s_name,0 as avg_score from 
    student a 
    where a.s_id not in (
                select distinct s_id from score);


-- 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
select a.s_id,a.s_name,count(b.c_id) as sum_course,sum(b.s_score) as sum_score from 
    student a 
    left join score b on a.s_id=b.s_id
    GROUP BY a.s_id,a.s_name;


-- 6、查询"李"姓老师的数量 
select count(t_id) from teacher where t_name like ‘李%‘;

-- 7、查询学过"张三"老师授课的同学的信息 
select a.* from 
    student a 
    join score b on a.s_id=b.s_id where b.c_id in(
        select c_id from course where t_id =(
            select t_id from teacher where t_name = ‘张三‘));

-- 8、查询没学过"张三"老师授课的同学的信息 
select * from 
    student c 
    where c.s_id not in(
        select a.s_id from student a join score b on a.s_id=b.s_id where b.c_id in(
            select c_id from course where t_id =(
                select t_id from teacher where t_name = ‘张三‘)));
-- 9、查询学过编号为"01"并且也学过编号为"02"的课程的同学的信息

select a.* from 
    student a,score b,score c 
    where a.s_id = b.s_id  and a.s_id = c.s_id and b.c_id=‘01‘ and c.c_id=‘02‘;

-- 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 a.* from 
    student a 
    where a.s_id in (select s_id from score where c_id=‘01‘ ) and a.s_id not in(select s_id from score where c_id=‘02‘)


-- 11、查询没有学全所有课程的同学的信息 

select s.* from 
    student s where s.s_id in(
        select s_id from score where s_id not in(
            select a.s_id from score a 
                join score b on a.s_id = b.s_id and b.c_id=‘02‘
                join score c on a.s_id = c.s_id and c.c_id=‘03‘
            where a.c_id=‘01‘))

-- 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 * from student where s_id in(
    select distinct a.s_id from score a where a.c_id in(select a.c_id from score a where a.s_id=‘01‘)
    );

-- 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 a.* from student a where a.s_id in(
    select distinct s_id from score where s_id!=‘01‘ and c_id in(select c_id from score where s_id=‘01‘)
    group by s_id 
    having count(1)=(select count(1) from score where s_id=‘01‘));
-- 14、查询没学过"张三"老师讲授的任一门课程的学生姓名 
select a.s_name from student a where a.s_id not in (
    select s_id from score where c_id = 
                (select c_id from course where t_id =(
                    select t_id from teacher where t_name = ‘张三‘)) 
                group by s_id);

-- 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 a.s_id,a.s_name,ROUND(AVG(b.s_score)) from 
    student a 
    left join score b on a.s_id = b.s_id
    where a.s_id in(
            select s_id from score where s_score<60 GROUP BY  s_id having count(1)>=2)
    GROUP BY a.s_id,a.s_name

-- 16、检索"01"课程分数小于60，按分数降序排列的学生信息
select a.*,b.c_id,b.s_score from 
    student a,score b 
    where a.s_id = b.s_id and b.c_id=‘01‘ and b.s_score<60 ORDER BY b.s_score DESC;

-- 17、按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩
select a.s_id,(select s_score from score where s_id=a.s_id and c_id=‘01‘) as 语文,
                (select s_score from score where s_id=a.s_id and c_id=‘02‘) as 数学,
                (select s_score from score where s_id=a.s_id and c_id=‘03‘) as 英语,
            round(avg(s_score),2) as 平均分 from score a  GROUP BY a.s_id ORDER BY 平均分 DESC;

-- 18.查询各科成绩最高分、最低分和平均分：以如下形式显示：课程ID，课程name，最高分，最低分，平均分，及格率，中等率，优良率，优秀率
--及格为>=60，中等为：70-80，优良为：80-90，优秀为：>=90
select a.c_id,b.c_name,MAX(s_score),MIN(s_score),ROUND(AVG(s_score),2),
    ROUND(100*(SUM(case when a.s_score>=60 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 及格率,
    ROUND(100*(SUM(case when a.s_score>=70 and a.s_score<=80 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 中等率,
    ROUND(100*(SUM(case when a.s_score>=80 and a.s_score<=90 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 优良率,
    ROUND(100*(SUM(case when a.s_score>=90 then 1 else 0 end)/SUM(case when a.s_score then 1 else 0 end)),2) as 优秀率
    from score a left join course b on a.c_id = b.c_id GROUP BY a.c_id,b.c_name

-- 19、按各科成绩进行排序，并显示排名(实现不完全)
-- mysql没有rank函数
    select a.s_id,a.c_id,
        @i:=@i +1 as i保留排名,
        @k:=(case when @score=a.s_score then @k else @i end) as rank不保留排名,
        @score:=a.s_score as score
    from (
        select s_id,c_id,s_score from score WHERE c_id=‘01‘ GROUP BY s_id,c_id,s_score ORDER BY s_score DESC
)a,(select @k:=0,@i:=0,@score:=0)s
    union
    select a.s_id,a.c_id,
        @i:=@i +1 as i,
        @k:=(case when @score=a.s_score then @k else @i end) as rank,
        @score:=a.s_score as score
    from (
        select s_id,c_id,s_score from score WHERE c_id=‘02‘ GROUP BY s_id,c_id,s_score ORDER BY s_score DESC
)a,(select @k:=0,@i:=0,@score:=0)s
    union
    select a.s_id,a.c_id,
        @i:=@i +1 as i,
        @k:=(case when @score=a.s_score then @k else @i end) as rank,
        @score:=a.s_score as score
    from (
        select s_id,c_id,s_score from score WHERE c_id=‘03‘ GROUP BY s_id,c_id,s_score ORDER BY s_score DESC
)a,(select @k:=0,@i:=0,@score:=0)s

-- 20、查询学生的总成绩并进行排名
select a.s_id,
    @i:=@i+1 as i,
    @k:=(case when @score=a.sum_score then @k else @i end) as rank,
    @score:=a.sum_score as score
from (select s_id,SUM(s_score) as sum_score from score GROUP BY s_id ORDER BY sum_score DESC)a,
    (select @k:=0,@i:=0,@score:=0)s

-- 21、查询不同老师所教不同课程平均分从高到低显示
<span class="hljs-keyword">select</span> a.t_id,c.t_name,a.c_id,ROUND(<span class="hljs-aggregate">avg</span>(s_score),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> avg_score <span class="hljs-keyword">from</span> course a
    <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> score b <span class="hljs-keyword">on</span> a.c_id=b.c_id 
    <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> teacher c <span class="hljs-keyword">on</span> a.t_id=c.t_id
    <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> a.c_id,a.t_id,c.t_name <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> avg_score <span class="hljs-keyword">DESC</span>;</span>
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– 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

        <span class="hljs-operator"><span class="hljs-keyword">select</span> d.*,c.排名,c.s_score,c.c_id <span class="hljs-keyword">from</span> (
            <span class="hljs-keyword">select</span> a.s_id,a.s_score,a.c_id,@i:=@i+<span class="hljs-number">1</span> <span class="hljs-keyword">as</span> 排名 <span class="hljs-keyword">from</span> score a,(<span class="hljs-keyword">select</span> @i:=<span class="hljs-number">0</span>)s <span class="hljs-keyword">where</span> a.c_id=<span class="hljs-string">‘01‘</span>    
        )c
        <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> student d <span class="hljs-keyword">on</span> c.s_id=d.s_id
        <span class="hljs-keyword">where</span> 排名 BETWEEN <span class="hljs-number">2</span> <span class="hljs-keyword">AND</span> <span class="hljs-number">3</span>
        <span class="hljs-keyword">UNION</span>
        <span class="hljs-keyword">select</span> d.*,c.排名,c.s_score,c.c_id <span class="hljs-keyword">from</span> (
            <span class="hljs-keyword">select</span> a.s_id,a.s_score,a.c_id,@j:=@j+<span class="hljs-number">1</span> <span class="hljs-keyword">as</span> 排名 <span class="hljs-keyword">from</span> score a,(<span class="hljs-keyword">select</span> @j:=<span class="hljs-number">0</span>)s <span class="hljs-keyword">where</span> a.c_id=<span class="hljs-string">‘02‘</span>    
        )c
        <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> student d <span class="hljs-keyword">on</span> c.s_id=d.s_id
        <span class="hljs-keyword">where</span> 排名 BETWEEN <span class="hljs-number">2</span> <span class="hljs-keyword">AND</span> <span class="hljs-number">3</span>
        <span class="hljs-keyword">UNION</span>
        <span class="hljs-keyword">select</span> d.*,c.排名,c.s_score,c.c_id <span class="hljs-keyword">from</span> (
            <span class="hljs-keyword">select</span> a.s_id,a.s_score,a.c_id,@k:=@k+<span class="hljs-number">1</span> <span class="hljs-keyword">as</span> 排名 <span class="hljs-keyword">from</span> score a,(<span class="hljs-keyword">select</span> @k:=<span class="hljs-number">0</span>)s <span class="hljs-keyword">where</span> a.c_id=<span class="hljs-string">‘03‘</span>    
        )c
        <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> student d <span class="hljs-keyword">on</span> c.s_id=d.s_id
        <span class="hljs-keyword">where</span> 排名 BETWEEN <span class="hljs-number">2</span> <span class="hljs-keyword">AND</span> <span class="hljs-number">3</span>;</span>
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– 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],[70-60],[0-60]及所占百分比

    <span class="hljs-operator"><span class="hljs-keyword">select</span> <span class="hljs-keyword">distinct</span> f.c_name,a.c_id,b.<span class="hljs-string">`85-100`</span>,b.百分比,c.<span class="hljs-string">`70-85`</span>,c.百分比,d.<span class="hljs-string">`60-70`</span>,d.百分比,e.<span class="hljs-string">`0-60`</span>,e.百分比 <span class="hljs-keyword">from</span> score a
            <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> (<span class="hljs-keyword">select</span> c_id,<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">85</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">100</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">`85-100`</span>,
                                        ROUND(<span class="hljs-number">100</span>*(<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">85</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">100</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>)/<span class="hljs-aggregate">count</span>(*)),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> 百分比
                            <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id)b <span class="hljs-keyword">on</span> a.c_id=b.c_id
            <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> (<span class="hljs-keyword">select</span> c_id,<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">70</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">85</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">`70-85`</span>,
                                        ROUND(<span class="hljs-number">100</span>*(<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">70</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">85</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>)/<span class="hljs-aggregate">count</span>(*)),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> 百分比
                            <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id)c <span class="hljs-keyword">on</span> a.c_id=c.c_id
            <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> (<span class="hljs-keyword">select</span> c_id,<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">60</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">70</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">`60-70`</span>,
                                        ROUND(<span class="hljs-number">100</span>*(<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;<span class="hljs-number">60</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">70</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>)/<span class="hljs-aggregate">count</span>(*)),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> 百分比
                            <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id)d <span class="hljs-keyword">on</span> a.c_id=d.c_id
            <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> (<span class="hljs-keyword">select</span> c_id,<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;=<span class="hljs-number">0</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">60</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">`0-60`</span>,
                                        ROUND(<span class="hljs-number">100</span>*(<span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> s_score &gt;=<span class="hljs-number">0</span> <span class="hljs-keyword">and</span> s_score &lt;=<span class="hljs-number">60</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>)/<span class="hljs-aggregate">count</span>(*)),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> 百分比
                            <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id)e <span class="hljs-keyword">on</span> a.c_id=e.c_id
            <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> course f <span class="hljs-keyword">on</span> a.c_id = f.c_id
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– 24、查询学生平均成绩及其名次 

    <span class="hljs-keyword">select</span> a.s_id,
            @i:=@i+<span class="hljs-number">1</span> <span class="hljs-keyword">as</span> <span class="hljs-string">‘不保留空缺排名‘</span>,
            @k:=(<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> @avg_score=a.avg_s <span class="hljs-keyword">then</span> @k <span class="hljs-keyword">else</span> @i <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">‘保留空缺排名‘</span>,
            @avg_score:=avg_s <span class="hljs-keyword">as</span> <span class="hljs-string">‘平均分‘</span>
    <span class="hljs-keyword">from</span> (<span class="hljs-keyword">select</span> s_id,ROUND(<span class="hljs-aggregate">AVG</span>(s_score),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> avg_s <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> s_id)a,(<span class="hljs-keyword">select</span> @avg_score:=<span class="hljs-number">0</span>,@i:=<span class="hljs-number">0</span>,@k:=<span class="hljs-number">0</span>)b;</span>
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– 25、查询各科成绩前三名的记录
– 1.选出b表比a表成绩大的所有组
– 2.选出比当前id成绩大的 小于三个的
select a.s_id,a.c_id,a.s_score from score a
left join score b on a.c_id = b.c_id and a.s_score<b.s_score
group by a.s_id,a.c_id,a.s_score HAVING COUNT(b.s_id)<3
ORDER BY a.c_id,a.s_score DESC

– 26、查询每门课程被选修的学生数 

    <span class="hljs-keyword">select</span> c_id,<span class="hljs-aggregate">count</span>(s_id) <span class="hljs-keyword">from</span> score a <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id
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– 27、查询出只有两门课程的全部学生的学号和姓名
select s_id,s_name from student where s_id in(
select s_id from score GROUP BY s_id HAVING COUNT(c_id)=2);

– 28、查询男生、女生人数
select s_sex,COUNT(s_sex) as 人数 from student GROUP BY s_sex

– 29、查询名字中含有“风”字的学生信息

    <span class="hljs-keyword">select</span> * <span class="hljs-keyword">from</span> student <span class="hljs-keyword">where</span> s_name <span class="hljs-keyword">like</span> <span class="hljs-string">‘%风%‘</span>;</span>
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– 30、查询同名同性学生名单，并统计同名人数 

    <span class="hljs-operator"><span class="hljs-keyword">select</span> a.s_name,a.s_sex,<span class="hljs-aggregate">count</span>(*) <span class="hljs-keyword">from</span> student a  <span class="hljs-keyword">JOIN</span> 
                student b <span class="hljs-keyword">on</span> a.s_id !=b.s_id <span class="hljs-keyword">and</span> a.s_name = b.s_name <span class="hljs-keyword">and</span> a.s_sex = b.s_sex
    <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> a.s_name,a.s_sex
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– 31、查询1990年出生的学生名单

    <span class="hljs-keyword">select</span> s_name <span class="hljs-keyword">from</span> student <span class="hljs-keyword">where</span> s_birth <span class="hljs-keyword">like</span> <span class="hljs-string">‘1990%‘</span>
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– 32、查询每门课程的平均成绩，结果按平均成绩降序排列，平均成绩相同时，按课程编号升序排列 

<span class="hljs-keyword">select</span> c_id,ROUND(<span class="hljs-aggregate">AVG</span>(s_score),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> avg_score <span class="hljs-keyword">from</span> score <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> c_id <span class="hljs-keyword">ORDER</span> <span class="hljs-keyword">BY</span> avg_score <span class="hljs-keyword">DESC</span>,c_id <span class="hljs-keyword">ASC</span>
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– 33、查询平均成绩大于等于85的所有学生的学号、姓名和平均成绩 

<span class="hljs-keyword">select</span> a.s_id,b.s_name,ROUND(<span class="hljs-aggregate">avg</span>(a.s_score),<span class="hljs-number">2</span>) <span class="hljs-keyword">as</span> avg_score <span class="hljs-keyword">from</span> score a
    <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> student b <span class="hljs-keyword">on</span> a.s_id=b.s_id <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> s_id <span class="hljs-keyword">HAVING</span> avg_score&gt;=<span class="hljs-number">85</span>
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– 34、查询课程名称为“数学”，且分数低于60的学生姓名和分数 

    <span class="hljs-keyword">select</span> a.s_name,b.s_score <span class="hljs-keyword">from</span> score b <span class="hljs-keyword">LEFT</span> <span class="hljs-keyword">JOIN</span> student a <span class="hljs-keyword">on</span> a.s_id=b.s_id <span class="hljs-keyword">where</span> b.c_id=(
                <span class="hljs-keyword">select</span> c_id <span class="hljs-keyword">from</span> course <span class="hljs-keyword">where</span> c_name =<span class="hljs-string">‘数学‘</span>) <span class="hljs-keyword">and</span> b.s_score&lt;<span class="hljs-number">60</span>
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– 35、查询所有学生的课程及分数情况； 

    <span class="hljs-keyword">select</span> a.s_id,a.s_name,
                <span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> c.c_name <span class="hljs-keyword">when</span> <span class="hljs-string">‘语文‘</span> <span class="hljs-keyword">then</span> b.s_score <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">‘语文‘</span>,
                <span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> c.c_name <span class="hljs-keyword">when</span> <span class="hljs-string">‘数学‘</span> <span class="hljs-keyword">then</span> b.s_score <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">‘数学‘</span>,
                <span class="hljs-aggregate">SUM</span>(<span class="hljs-keyword">case</span> c.c_name <span class="hljs-keyword">when</span> <span class="hljs-string">‘英语‘</span> <span class="hljs-keyword">then</span> b.s_score <span class="hljs-keyword">else</span> <span class="hljs-number">0</span> <span class="hljs-keyword">end</span>) <span class="hljs-keyword">as</span> <span class="hljs-string">‘英语‘</span>,
                <span class="hljs-aggregate">SUM</span>(b.s_score) <span class="hljs-keyword">as</span>  <span class="hljs-string">‘总分‘</span>
    <span class="hljs-keyword">from</span> student a <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> score b <span class="hljs-keyword">on</span> a.s_id = b.s_id 
    <span class="hljs-keyword">left</span> <span class="hljs-keyword">join</span> course c <span class="hljs-keyword">on</span> b.c_id = c.c_id 
    <span class="hljs-keyword">GROUP</span> <span class="hljs-keyword">BY</span> a.s_id,a.s_name
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– 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；
select a.s_name,b.c_name,c.s_score from course b left join score c on b.c_id = c.c_id
left join student a on a.s_id=c.s_id where c.s_score>=70

– 37、查询不及格的课程
select a.s_id,a.c_id,b.c_name,a.s_score from score a left join course b on a.c_id = b.c_id
where a.s_score<60

–38、查询课程编号为01且课程成绩在80分以上的学生的学号和姓名；
select a.s_id,b.s_name from score a LEFT JOIN student b on a.s_id = b.s_id
where a.c_id = ‘01’ and a.s_score>80

– 39、求每门课程的学生人数
select count(*) from score GROUP BY c_id;

– 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

    <span class="hljs-comment">-- 查询老师id   </span>
    <span class="hljs-operator"><span class="hljs-keyword">select</span> c_id <span class="hljs-keyword">from</span> course c,teacher d <span class="hljs-keyword">where</span> c.t_id=d.t_id <span class="hljs-keyword">and</span> d.t_name=<span class="hljs-string">‘张三‘</span>
    -- 查询最高分（可能有相同分数）
    <span class="hljs-keyword">select</span> <span class="hljs-aggregate">MAX</span>(s_score) <span class="hljs-keyword">from</span> score <span class="hljs-keyword">where</span> c_id=<span class="hljs-string">‘02‘</span>
    -- 查询信息
    <span class="hljs-keyword">select</span> a.*,b.s_score,b.c_id,c.c_name <span class="hljs-keyword">from</span> student a
        <span class="hljs-keyword">LEFT</span> <span class="hljs-keyword">JOIN</span> score b <span class="hljs-keyword">on</span> a.s_id = b.s_id
        <span class="hljs-keyword">LEFT</span> <span class="hljs-keyword">JOIN</span> course c <span class="hljs-keyword">on</span> b.c_id=c.c_id
        <span class="hljs-keyword">where</span> b.c_id =(<span class="hljs-keyword">select</span> c_id <span class="hljs-keyword">from</span> course c,teacher d <span class="hljs-keyword">where</span> c.t_id=d.t_id <span class="hljs-keyword">and</span> d.t_name=<span class="hljs-string">‘张三‘</span>)
        <span class="hljs-keyword">and</span> b.s_score <span class="hljs-keyword">in</span> (<span class="hljs-keyword">select</span> <span class="hljs-aggregate">MAX</span>(s_score) <span class="hljs-keyword">from</span> score <span class="hljs-keyword">where</span> c_id=<span class="hljs-string">‘02‘</span>)
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– 41、查询不同课程成绩相同的学生的学生编号、课程编号、学生成绩
select DISTINCT b.s_id,b.c_id,b.s_score from score a,score b where a.c_id != b.c_id and a.s_score = b.s_score

– 42、查询每门功成绩最好的前两名
– 牛逼的写法
select a.s_id,a.c_id,a.s_score from score a
where (select COUNT(1) from score b where b.c_id=a.c_id and b.s_score>=a.s_score)<=2 ORDER BY a.c_id

– 43、统计每门课程的学生选修人数（超过5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
select c_id,count(*) as total from score GROUP BY c_id HAVING total>5 ORDER BY total,c_id ASC

– 44、检索至少选修两门课程的学生学号
select s_id,count(*) as sel from score GROUP BY s_id HAVING sel>=2

– 45、查询选修了全部课程的学生信息
select * from student where s_id in(
select s_id from score GROUP BY s_id HAVING count()=(select count() from course))

–46、查询各学生的年龄
– 按照出生日期来算，当前月日 < 出生年月的月日则，年龄减一

<span class="hljs-keyword">select</span> s_birth,(DATE_FORMAT(NOW(),<span class="hljs-string">‘%Y‘</span>)-DATE_FORMAT(s_birth,<span class="hljs-string">‘%Y‘</span>) - 
            (<span class="hljs-keyword">case</span> <span class="hljs-keyword">when</span> DATE_FORMAT(NOW(),<span class="hljs-string">‘%m%d‘</span>)&gt;DATE_FORMAT(s_birth,<span class="hljs-string">‘%m%d‘</span>) <span class="hljs-keyword">then</span> <span class="hljs-number">0</span> <span class="hljs-keyword">else</span> <span class="hljs-number">1</span> <span class="hljs-keyword">end</span>)) <span class="hljs-keyword">as</span> age
    <span class="hljs-keyword">from</span> student;</span>
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– 47、查询本周过生日的学生
select * from student where WEEK(DATE_FORMAT(NOW(),‘%Y%m%d’))=WEEK(s_birth)
select * from student where YEARWEEK(s_birth)=YEARWEEK(DATE_FORMAT(NOW(),‘%Y%m%d’))

<span class="hljs-keyword">select</span> WEEK(DATE_FORMAT(NOW(),<span class="hljs-string">‘%Y%m%d‘</span>))
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– 48、查询下周过生日的学生
select * from student where WEEK(DATE_FORMAT(NOW(),‘%Y%m%d’))+1 =WEEK(s_birth)

– 49、查询本月过生日的学生

<span class="hljs-keyword">select</span> * <span class="hljs-keyword">from</span> student <span class="hljs-keyword">where</span> <span class="hljs-keyword">MONTH</span>(DATE_FORMAT(NOW(),<span class="hljs-string">‘%Y%m%d‘</span>)) =<span class="hljs-keyword">MONTH</span>(s_birth)
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– 50、查询下月过生日的学生
select * from student where MONTH(DATE_FORMAT(NOW(),‘%Y%m%d’))+1 =MONTH(s_birth)

SQL经典练习题

原文：https://www.cnblogs.com/zh-423426/p/12896756.html
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