mysql练习题

╰+哭是因爲堅強的太久メ 2022-11-26 04:57 179阅读 0赞

# mysql练习题 #

### 1、表结构 ###

–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

### 2、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`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    --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`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    --教师表
    CREATE TABLE `teacher`(
        `t_id` VARCHAR(20),
        `t_name` VARCHAR(20) NOT NULL DEFAULT '',
        PRIMARY KEY(`t_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    --成绩表
    CREATE TABLE `score`(
        `s_id` VARCHAR(20),
        `c_id`  VARCHAR(20),
        `s_score` INT(3),
        PRIMARY KEY(`s_id`,`c_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    --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);

### 3、测试题 ###

-- 1、查询"01"课程比"02"课程成绩高的学生的信息及课程分数 
    --My:
    SELECT 
      a.*,
      b.`s_score` AS 1_score,
      c.`s_score` AS 2_score 
    FROM
      student AS a 
      JOIN score AS b 
        ON a.`s_id` = b.`s_id` 
        AND b.`c_id` = "01" 
      LEFT JOIN score AS 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`;
    --Other:
    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 
    --My:
    SELECT 
      a.*,
      b.`s_score` AS 1_score,
      c.`s_score` AS 2_score 
    FROM
      student AS a 
      JOIN score AS b 
        ON a.`s_id` = b.`s_id` 
        AND b.`c_id` = "01" 
      LEFT JOIN score AS 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`;
    --Other:
    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
    --My:
    SELECT 
      a.`s_id`,
      a.`s_name`,
      ROUND(AVG(b.`s_score`),2) AS avg_score 
    FROM
      student AS a 
      JOIN score AS b 
        ON a.`s_id` = b.`s_id` 
    GROUP BY a.`s_id`,
      a.`s_name` 
    HAVING avg_score >=60;
    --Other:
    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) 
    --My:
    SELECT 
      a.`s_id`,
      a.`s_name`,
      IFNULL(ROUND(AVG(b.s_score),2),0) AS score_avg
    FROM
      student AS a 
      LEFT JOIN score AS b 
        ON a.`s_id` = b.`s_id` 
        OR b.`s_score` = NULL
    GROUP BY a.`s_id`,a.`s_name` 
    HAVING score_avg <60;
    --Other:
    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
    --My:
    SELECT a.s_id,a.s_name,COUNT(DISTINCT b.c_id),IFNULL(SUM(b.s_score),0)  FROM student AS a  LEFT JOIN score AS b ON a.s_id = b.s_id GROUP BY a.s_id,a.s_name;
    --Other:
    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 
    --My:
    SELECT COUNT(t_id) FROM teacher WHERE t_name LIKE "李%";
    --Other:
    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 
    --My:
    SELECT * FROM student WHERE s_id IN (SELECT DISTINCT s_id FROM score WHERE c_id IN (SELECT DISTINCT c_id FROM course AS cou JOIN teacher AS tec ON cou.t_id = tec.`t_id` WHERE tec.`t_name`="张三"));
    --Other:
    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 
    --My:
    SELECT * FROM student WHERE s_id NOT IN(SELECT DISTINCT s_id FROM score WHERE c_id IN (SELECT DISTINCT c_id FROM course AS cou JOIN teacher AS tec ON cou.t_id = tec.`t_id` WHERE tec.`t_name`="张三"));
    --Other:
    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 
    --My:
    SELECT * FROM student WHERE s_id IN (SELECT DISTINCT s_id FROM score WHERE c_id IN('01','02'));
    --Other:
    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
    --My:
    SELECT * FROM student WHERE s_id IN (SELECT DISTINCT s_id FROM score WHERE c_id = '01') AND s_id NOT IN (SELECT DISTINCT s_id FROM score WHERE c_id = '02');
    --Other:
    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 
    --My:
    SELECT * FROM student WHERE s_id IN (SELECT a.s_id FROM student AS a JOIN score AS b  ON a.`s_id` = b.`s_id` GROUP BY s_id HAVING COUNT(a.s_id) !=3);
    --Other:
    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
    --My:
    --Other:
    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 
    --My:
    --Other:
    SELECT
    	* 
    FROM
    	student 
    WHERE
    	s_id IN (
    	SELECT
    		s_id 
    	FROM
    		(
    		SELECT
    			s_id,
    			COUNT( s_id ) cou 
    		FROM
    			(
    			SELECT
    				* 
    			FROM
    				score 
    			WHERE
    				s_id IN (
    				SELECT
    					s_id 
    				FROM
    					( SELECT s_id, COUNT( s_id ) count FROM score WHERE s_id != '01' GROUP BY s_id ) t1 
    				WHERE
    					t1.count = ( SELECT count( c_id ) FROM score WHERE s_id = '01' ) 
    				) 
    			) t3 
    		WHERE
    			t3.c_id IN ( SELECT c_id FROM score WHERE s_id = '01' ) 
    		GROUP BY
    			s_id 
    		) t4 
    WHERE
    	t4.cou = ( SELECT count( c_id ) 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 
    --My:
    --Other:
    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 
    --My:
    --Other:
    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
    --My:
    --Other:
    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
    --My:
    --Other:
    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
    --My:
    --Other:
    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
    --My:
    --Other:
        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
    --My:
    --Other:
    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 
    --My:
    --Other:
        select a.t_id,c.t_name,a.c_id,ROUND(avg(s_score),2) as avg_score from course a
            left join score b on a.c_id=b.c_id 
            left join teacher c on a.t_id=c.t_id
            GROUP BY a.c_id,a.t_id,c.t_name ORDER BY avg_score DESC;
    -- 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 
    --My:
    --Other:
                select d.*,c.排名,c.s_score,c.c_id from (
                    select a.s_id,a.s_score,a.c_id,@i:=@i+1 as 排名 from score a,(select @i:=0)s where a.c_id='01'    
                )c
                left join student d on c.s_id=d.s_id
                where 排名 BETWEEN 2 AND 3
                UNION
                select d.*,c.排名,c.s_score,c.c_id from (
                    select a.s_id,a.s_score,a.c_id,@j:=@j+1 as 排名 from score a,(select @j:=0)s where a.c_id='02'    
                )c
                left join student d on c.s_id=d.s_id
                where 排名 BETWEEN 2 AND 3
                UNION
                select d.*,c.排名,c.s_score,c.c_id from (
                    select a.s_id,a.s_score,a.c_id,@k:=@k+1 as 排名 from score a,(select @k:=0)s where a.c_id='03'    
                )c
                left join student d on c.s_id=d.s_id
                where 排名 BETWEEN 2 AND 3;
    -- 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
    --My:
    --Other:
            select distinct f.c_name,a.c_id,b.`85-100`,b.百分比,c.`70-85`,c.百分比,d.`60-70`,d.百分比,e.`0-60`,e.百分比 from score a
                    left join (select c_id,SUM(case when s_score >85 and s_score <=100 then 1 else 0 end) as `85-100`,
                                                ROUND(100*(SUM(case when s_score >85 and s_score <=100 then 1 else 0 end)/count(*)),2) as 百分比
                                    from score GROUP BY c_id)b on a.c_id=b.c_id
                    left join (select c_id,SUM(case when s_score >70 and s_score <=85 then 1 else 0 end) as `70-85`,
                                                ROUND(100*(SUM(case when s_score >70 and s_score <=85 then 1 else 0 end)/count(*)),2) as 百分比
                                    from score GROUP BY c_id)c on a.c_id=c.c_id
                    left join (select c_id,SUM(case when s_score >60 and s_score <=70 then 1 else 0 end) as `60-70`,
                                                ROUND(100*(SUM(case when s_score >60 and s_score <=70 then 1 else 0 end)/count(*)),2) as 百分比
                                    from score GROUP BY c_id)d on a.c_id=d.c_id
                    left join (select c_id,SUM(case when s_score >=0 and s_score <=60 then 1 else 0 end) as `0-60`,
                                                ROUND(100*(SUM(case when s_score >=0 and s_score <=60 then 1 else 0 end)/count(*)),2) as 百分比
                                    from score GROUP BY c_id)e on a.c_id=e.c_id
                    left join course f on a.c_id = f.c_id
    -- 24、查询学生平均成绩及其名次 
    --My:
    --Other:
            select a.s_id,
                    @i:=@i+1 as '不保留空缺排名',
                    @k:=(case when @avg_score=a.avg_s then @k else @i end) as '保留空缺排名',
                    @avg_score:=avg_s as '平均分'
            from (select s_id,ROUND(AVG(s_score),2) as avg_s from score GROUP BY s_id)a,(select @avg_score:=0,@i:=0,@k:=0)b;
    -- 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
    --My:
    --Other:
            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 
    --My:
    --Other:
            select c_id,count(s_id) from score a GROUP BY c_id 
    -- 27、查询出只有两门课程的全部学生的学号和姓名
    --My:
    --Other:
            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 
    --My:
    --Other:
            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
    --My:
    --Other:
            select * from student where s_name like '%风%';
    -- 30、查询同名同性学生名单，并统计同名人数 
    --My:
    --Other:
            select a.s_name,a.s_sex,count(*) from student a  JOIN 
                        student b on a.s_id !=b.s_id and a.s_name = b.s_name and a.s_sex = b.s_sex
            GROUP BY a.s_name,a.s_sex
    -- 31、查询1990年出生的学生名单 
    --My:
    --Other:
            select s_name from student where s_birth like '1990%' 
    -- 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 
    --My:
    --Other: 
        select c_id,ROUND(AVG(s_score),2) as avg_score from score GROUP BY c_id ORDER BY avg_score DESC,c_id ASC
    -- 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 
    --My:
    --Other: 
        select a.s_id,b.s_name,ROUND(avg(a.s_score),2) as avg_score from score a
            left join student b on a.s_id=b.s_id GROUP BY s_id HAVING avg_score>=85
    -- 34、查询课程名称为"数学"，且分数低于60的学生姓名和分数 
    --My:
    --Other: 
            select a.s_name,b.s_score from score b LEFT JOIN student a on a.s_id=b.s_id where b.c_id=(
                        select c_id from course where c_name ='数学') and b.s_score<60 
    -- 35、查询所有学生的课程及分数情况； 
    --My:
    --Other:
            select a.s_id,a.s_name,
                        SUM(case c.c_name when '语文' then b.s_score else 0 end) as '语文',
                        SUM(case c.c_name when '数学' then b.s_score else 0 end) as '数学',
                        SUM(case c.c_name when '英语' then b.s_score else 0 end) as '英语',
                        SUM(b.s_score) as  '总分'
            from student a left join score b on a.s_id = b.s_id 
            left join course c on b.c_id = c.c_id 
            GROUP BY a.s_id,a.s_name  
     -- 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；
     --My:
    --Other:
                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
    --My:
    --Other:
            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； 
    --My:
    --Other:
            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 
    --My:
    --Other:
            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
    --My:
    --Other:
            -- 查询老师id 
            select c_id from course c,teacher d where c.t_id=d.t_id and d.t_name='张三'
            -- 查询最高分（可能有相同分数）
            select MAX(s_score) from score where c_id='02'
            -- 查询信息
            select a.*,b.s_score,b.c_id,c.c_name from student a
                LEFT JOIN Score b on a.s_id = b.s_id
                LEFT JOIN course c on b.c_id=c.c_id
                where b.c_id =(select c_id from course c,Teacher d where c.t_id=d.t_id and d.t_name='张三')
                and b.s_score in (select MAX(s_score) from Score where c_id=(select c_id from course c,Teacher d where c.t_id=d.t_id and d.t_name='张三'))
    -- 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 
    --My:
    --Other:
        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 
    --My:
    --Other:
            -- 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 
    --My:
    --Other:
            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 
    --My:
    --Other:
            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 
    --My:
    --Other:
            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
    --My:
    --Other:
        select s_birth,(DATE_FORMAT(NOW(),'%Y')-DATE_FORMAT(s_birth,'%Y') - 
                    (case when DATE_FORMAT(NOW(),'%m%d')>DATE_FORMAT(s_birth,'%m%d') then 0 else 1 end)) as age
            from student;
    -- 47、查询本周过生日的学生
    --My:
    --Other:
        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'))
        select WEEK(DATE_FORMAT(NOW(),'%Y%m%d')) 
    -- 48、查询下周过生日的学生
    --My:
    --Other:
        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
    --My:
    --Other:
        select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d')) =MONTH(s_birth)
    -- 50、查询下月过生日的学生
    --My:
    --Other:
        select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d'))+1 =MONTH(s_birth)