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提交日期 题目名称 提交代码
2026-04-05 人数最多的学生姓氏  
select left(name,1) as first_name,
	count(*) as cnt
from students
GROUP BY first_name
order by cnt DESC limit 5
2026-04-05 人数最多的学生姓氏  
select left(name,1) as first_name,
	count(*) as cnt
from students
GROUP BY first_name
order by cnt DESC
2026-04-05 学生信息和班主任姓名  
SELECT s.name, s.class_code, s.grade_code, t.name AS head_teacher_name from students s
join teachers t on s.class_code =t.head_teacher
order by s.student_id;
2026-04-05 学生信息和班主任姓名  
SELECT s.name, s.class_code, s.grade_code, t.name AS head_teacher_name from students s
join teachers t on s.class_code =t.head_teacher
2026-04-01 条件过滤（2）半夜活动有猫腻，Hour函数给给力  
select * from cmb_usr_trx_rcd where usr_id='5201314520' and date(trx_time) between'2024-09-01' and '2024-09-30' and hour(trx_time) between 1 and 5
2026-04-01 条件过滤（1）异地男友有异常，数分闺蜜来帮忙  
select * from cmb_usr_trx_rcd where usr_id=5201314520 and date(trx_time) between '2024-09-01' and '2024-09-30'
order by trx_time