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勋章 ①金银铜：在竞赛中获得第一二三名；②好习惯：自然月10天提交；③里程碑：解决1/2/5/10/20/50/100/200题；④每周打卡挑战：完成每周5题，每年1月1日清零。

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提交记录

提交日期 题目名称 提交代码
2026-03-28 人数最多的学生姓氏  
select
left(name,1) surname,count(name) cnt
from
students
group by left(name,1)
order by cnt desc
limit 5;
2026-03-28 人数最多的学生姓氏  
select
left(name,1) surname,count(left(name,1)) as cnt
from
students
group by surname
order by cnt
limit 5;
2026-03-28 文科潜力股  
select
*
from
scores
where (subject ='地理' or subject='政治' or subject='历史') and score>=90 
and exam_date ='2024-06-30'
order by score desc,student_id,subject
2026-03-28 给英语成绩中上水平的学生拔尖  
select
* 
from scores
where subject = '英语' and exam_date = '2024-06-30' and score between 100 and 110 order by score desc;
2026-03-28 学生信息和班主任姓名  
select 
students.name,students.class_code,grade_code,teachers.name as head_teacher_name
from
students inner join teachers on students.class_code = teachers.head_teacher
order by student_id;
2026-03-28 找出三个班级的女生  
select * from students 
where class_code in ('C219','C220','C221')
and
gender = 'f'
order by student_id;
2026-03-28 语文数学英语至少1门超过100分的同学  
select * from subject_score 
where chinese>100 or math>100 or english>100 order by chinese;
2026-03-28 语文数学英语至少1门超过100分的同学  
select * from subject_score 
where chinese>=100 or math>=100 or english>=100 order by chinese limit 5;
2026-03-28 语文数学英语至少1门超过100分的同学  
select * from subject_score 
where chinese>=100 or math>=100 or english>=100 order by chinese;
2026-03-28 语文数学英语至少1门超过100分的同学  
select * from subject_score where chinese>=100 order by chinese desc;