–1.學(xué)生表
Student(s_id,s_name,s_birth,s_sex) --學(xué)生編號(hào),學(xué)生姓名, 出生年月,學(xué)生性別
–2.課程表
Course(c_id,c_name,t_id) – --課程編號(hào), 課程名稱, 教師編號(hào)
–3.教師表
Teacher(t_id,t_name) --教師編號(hào),教師姓名
–4.成績表
Score(s_id,c_id,s_score) --學(xué)生編號(hào),課程編號(hào),分?jǐn)?shù)

--建表
--學(xué)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`)
);
--課程表
CREATE TABLE `Course`(
 `c_id`  VARCHAR(20),
 `c_name` VARCHAR(20) NOT NULL DEFAULT '',
 `t_id` VARCHAR(20) NOT NULL,
 PRIMARY KEY(`c_id`)
);
--教師表
CREATE TABLE `Teacher`(
 `t_id` VARCHAR(20),
 `t_name` VARCHAR(20) NOT NULL DEFAULT '',
 PRIMARY KEY(`t_id`)
);
--成績表
CREATE TABLE `Score`(
 `s_id` VARCHAR(20),
 `c_id`  VARCHAR(20),
 `s_score` INT(3),
 PRIMARY KEY(`s_id`,`c_id`)
);
--插入學(xué)生表測(cè)試數(shù)據(jù)
insert into Student values('01' , '趙雷' , '1990-01-01' , '男');
insert into Student values('02' , '錢電' , '1990-12-21' , '男');
insert into Student values('03' , '孫風(fēng)' , '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' , '吳蘭' , '1992-03-01' , '女');
insert into Student values('07' , '鄭竹' , '1989-07-01' , '女');
insert into Student values('08' , '王菊' , '1990-01-20' , '女');
--課程表測(cè)試數(shù)據(jù)
insert into Course values('01' , '語文' , '02');
insert into Course values('02' , '數(shù)學(xué)' , '01');
insert into Course values('03' , '英語' , '03');

--教師表測(cè)試數(shù)據(jù)
insert into Teacher values('01' , '張三');
insert into Teacher values('02' , '李四');
insert into Teacher values('03' , '王五');

--成績表測(cè)試數(shù)據(jù)
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);

-- 1、查詢"01"課程比"02"課程成績高的學(xué)生的信息及課程分?jǐn)?shù) 
 
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
 
--也可以這樣寫
 select a.*,b.s_score as 01_score,c.s_score as 02_score 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' 
   and b.s_score>c.s_score
-- 2、查詢"01"課程比"02"課程成績低的學(xué)生的信息及課程分?jǐn)?shù)
 
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、查詢平均成績大于等于60分的同學(xué)的學(xué)生編號(hào)和學(xué)生姓名和平均成績
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 avg_score >=60;
 

-- 4、查詢平均成績小于60分的同學(xué)的學(xué)生編號(hào)和學(xué)生姓名和平均成績
  -- (包括有成績的和無成績的)
  
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 avg_score <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、查詢所有同學(xué)的學(xué)生編號(hào)、學(xué)生姓名、選課總數(shù)、所有課程的總成績
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、查詢"李"姓老師的數(shù)量 
select count(t_id) from teacher where t_name like '李%';
 
-- 7、查詢學(xué)過"張三"老師授課的同學(xué)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 = '張三'));

-- 8、查詢沒學(xué)過"張三"老師授課的同學(xué)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 a.c_id from course a join teacher b on a.t_id = b.t_id where t_name ='張三'));
-- 9、查詢學(xué)過編號(hào)為"01"并且也學(xué)過編號(hào)為"02"的課程的同學(xué)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、查詢學(xué)過編號(hào)為"01"但是沒有學(xué)過編號(hào)為"02"的課程的同學(xué)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、查詢沒有學(xué)全所有課程的同學(xué)的信息 
--@wendiepei的寫法
select s.* from student s 
left join Score s1 on s1.s_id=s.s_id
group by s.s_id having count(s1.c_id)<(select count(*) from course) 
--@k1051785839的寫法
select *
from student
where s_id not in(
select s_id from score t1  
group by s_id having count(*) =(select count(distinct c_id)  from course)) 
-- 12、查詢至少有一門課與學(xué)號(hào)為"01"的同學(xué)所學(xué)相同的同學(xué)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、查詢和"01"號(hào)的同學(xué)學(xué)習(xí)的課程完全相同的其他同學(xué)的信息 
--@ouyang_1993的寫法
SELECT
 Student.*
FROM
 Student
WHERE
 s_id IN (SELECT s_id FROM Score GROUP BY s_id HAVING COUNT(s_id) = (
    #下面的語句是找到'01'同學(xué)學(xué)習(xí)的課程數(shù)
    SELECT COUNT(c_id) FROM Score WHERE s_id = '01'
   )
 )
AND s_id NOT IN (
 #下面的語句是找到學(xué)過‘01’同學(xué)沒學(xué)過的課程，有哪些同學(xué)。并排除他們
 SELECT s_id FROM Score
 WHERE c_id IN(
   #下面的語句是找到‘01’同學(xué)沒學(xué)過的課程
   SELECT DISTINCT c_id FROM Score
   WHERE c_id NOT IN (
     #下面的語句是找出‘01’同學(xué)學(xué)習(xí)的課程
     SELECT c_id FROM Score WHERE s_id = '01'
    )
  ) GROUP BY s_id
) #下面的條件是排除01同學(xué)
AND s_id NOT IN ('01')
--@k1051785839的寫法
SELECT
 t3.*
FROM
 (
  SELECT
   s_id,
   group_concat(c_id ORDER BY c_id) group1
  FROM
   score
  WHERE
   s_id &lt;> '01'
  GROUP BY
   s_id
 ) t1
INNER JOIN (
 SELECT
  group_concat(c_id ORDER BY c_id) group2
 FROM
  score
 WHERE
  s_id = '01'
 GROUP BY
  s_id
) t2 ON t1.group1 = t2.group2
INNER JOIN student t3 ON t1.s_id = t3.s_id

-- 14、查詢沒學(xué)過"張三"老師講授的任一門課程的學(xué)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 = '張三')));

-- 15、查詢兩門及其以上不及格課程的同學(xué)的學(xué)號(hào)，姓名及其平均成績 
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、檢索"01"課程分?jǐn)?shù)小于60，按分?jǐn)?shù)降序排列的學(xué)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、按平均成績從高到低顯示所有學(xué)生的所有課程的成績以及平均成績
select a.s_id,(select s_score from score where s_id=a.s_id and c_id='01') as 語文,
    (select s_score from score where s_id=a.s_id and c_id='02') as 數(shù)學(xué),
    (select s_score from score where s_id=a.s_id and c_id='03') as 英語,
   round(avg(s_score),2) as 平均分 from score a  GROUP BY a.s_id ORDER BY 平均分 DESC;
--@喝完這杯還有一箱的寫法
SELECT a.s_id,MAX(CASE a.c_id WHEN '01' THEN a.s_score END ) 語文, 
MAX(CASE a.c_id WHEN '02' THEN a.s_score END ) 數(shù)學(xué), 
MAX(CASE a.c_id WHEN '03' THEN a.s_score END ) 英語, 
avg(a.s_score),b.s_name FROM Score a JOIN Student b ON a.s_id=b.s_id GROUP BY a.s_id ORDER BY 5 DESC  
-- 18.查詢各科成績最高分、最低分和平均分：以如下形式顯示：課程ID，課程name，最高分，最低分，平均分，及格率，中等率，優(yōu)良率，優(yōu)秀率
--及格為>=60，中等為：70-80，優(yōu)良為：80-90，優(yōu)秀為：>=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 優(yōu)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 優(yōu)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、按各科成績進(jìn)行排序，并顯示排名
-- mysql沒有rank函數(shù)
 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 GROUP BY s_id,c_id,s_score ORDER BY s_score DESC
)a,(select @k:=0,@i:=0,@score:=0)s
--@k1051785839的寫法
(select * from (select 
t1.c_id,
t1.s_score,
(select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='01') rank
FROM score t1 where t1.c_id='01'
order by t1.s_score desc) t1)
union
(select * from (select 
t1.c_id,
t1.s_score,
(select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='02') rank
FROM score t1 where t1.c_id='02'
order by t1.s_score desc) t2)
union
(select * from (select 
t1.c_id,
t1.s_score,
(select count(distinct t2.s_score) from score t2 where t2.s_score>=t1.s_score and t2.c_id='03') rank
FROM score t1 where t1.c_id='03'
order by t1.s_score desc) t3)
-- 20、查詢學(xué)生的總成績并進(jìn)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、查詢不同老師所教不同課程平均分從高到低顯示 
  
 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、查詢所有課程的成績第2名到第3名的學(xué)生信息及該課程成績
   
   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'  
        ORDER BY a.s_score DESC  
            )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'  
        ORDER BY a.s_score DESC
            )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' 
        ORDER BY a.s_score DESC
            )c
            left join student d on c.s_id=d.s_id
            where 排名 BETWEEN 2 AND 3;
   
-- 23、統(tǒng)計(jì)各科成績各分?jǐn)?shù)段人數(shù)：課程編號(hào),課程名稱,[100-85],[85-70],[70-60],[0-60]及所占百分比


  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、查詢學(xué)生平均成績及其名次 

  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 ORDER BY avg_s DESC)a,(select @avg_score:=0,@i:=0,@k:=0)b;
-- 25、查詢各科成績前三名的記錄
   -- 1.選出b表比a表成績大的所有組
   -- 2.選出比當(dāng)前id成績大的 小于三個(gè)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、查詢每門課程被選修的學(xué)生數(shù) 

  select c_id,count(s_id) from score a GROUP BY c_id

-- 27、查詢出只有兩門課程的全部學(xué)生的學(xué)號(hào)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、查詢男生、女生人數(shù) 
  select s_sex,COUNT(s_sex) as 人數(shù)  from student GROUP BY s_sex

-- 29、查詢名字中含有"風(fēng)"字的學(xué)生信息

  select * from student where s_name like '%風(fēng)%';

-- 30、查詢同名同性學(xué)生名單，并統(tǒng)計(jì)同名人數(shù) 
  
  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、查詢1990年出生的學(xué)生名單
  
  select s_name from student where s_birth like '1990%'

-- 32、查詢每門課程的平均成績，結(jié)果按平均成績降序排列，平均成績相同時(shí)，按課程編號(hào)升序排列 

 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、查詢平均成績大于等于85的所有學(xué)生的學(xué)號(hào)、姓名和平均成績 

 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、查詢課程名稱為"數(shù)學(xué)"，且分?jǐn)?shù)低于60的學(xué)生姓名和分?jǐn)?shù) 
 
  select a.s_name,b.s_score from score b join student a on a.s_id=b.s_id where b.c_id=(
     select c_id from course where c_name ='數(shù)學(xué)') and b.s_score<60

-- 35、查詢所有學(xué)生的課程及分?jǐn)?shù)情況； 
 
  
  select a.s_id,a.s_name,
     SUM(case c.c_name when '語文' then b.s_score else 0 end) as '語文',
     SUM(case c.c_name when '數(shù)學(xué)' then b.s_score else 0 end) as '數(shù)學(xué)',
     SUM(case c.c_name when '英語' then b.s_score else 0 end) as '英語',
     SUM(b.s_score) as  '總分'
  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、查詢?nèi)魏我婚T課程成績?cè)?0分以上的姓名、課程名稱和分?jǐn)?shù)； 
   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、查詢不及格的課程
  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、查詢課程編號(hào)為01且課程成績?cè)?0分以上的學(xué)生的學(xué)號(hào)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、求每門課程的學(xué)生人數(shù) 
  select count(*) from score GROUP BY c_id;

-- 40、查詢選修"張三"老師所授課程的學(xué)生中，成績最高的學(xué)生信息及其成績

  
  -- 查詢老師id 
  select c_id from course c,teacher d where c.t_id=d.t_id and d.t_name='張三'
  -- 查詢最高分（可能有相同分?jǐn)?shù)）
  select MAX(s_score) from score where c_id='02'
  -- 查詢信息
  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='張三')
   and b.s_score in (select MAX(s_score) from score where c_id='02')


-- 41、查詢不同課程成績相同的學(xué)生的學(xué)生編號(hào)、課程編號(hào)、學(xué)生成績 
 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、查詢每門功成績最好的前兩名 
  -- 牛逼的寫法
 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、統(tǒng)計(jì)每門課程的學(xué)生選修人數(shù)（超過5人的課程才統(tǒng)計(jì)）。要求輸出課程號(hào)和選修人數(shù)，查詢結(jié)果按人數(shù)降序排列，若人數(shù)相同，按課程號(hào)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、檢索至少選修兩門課程的學(xué)生學(xué)號(hào) 
  select s_id,count(*) as sel from score GROUP BY s_id HAVING sel>=2

-- 45、查詢選修了全部課程的學(xué)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、查詢各學(xué)生的年齡
 -- 按照出生日期來算，當(dāng)前月日 < 出生年月的月日則，年齡減一

 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、查詢本周過生日的學(xué)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'))
 
 select WEEK(DATE_FORMAT(NOW(),'%Y%m%d'))

-- 48、查詢下周過生日的學(xué)生
 select * from student where WEEK(DATE_FORMAT(NOW(),'%Y%m%d'))+1 =WEEK(s_birth)

-- 49、查詢本月過生日的學(xué)生

 select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d')) =MONTH(s_birth)
 
-- 50、查詢下月過生日的學(xué)生
 select * from student where MONTH(DATE_FORMAT(NOW(),'%Y%m%d'))+1 =MONTH(s_birth)