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提交日期 题目名称 提交代码
2026-03-23 分组与聚合函数（2）擦边营收怎么样，聚合函数可看出  
select
date(trx_time) as trx_date,
max(trx_amt) as max_trx_amt,
min(trx_amt)as min_trx_amt,
avg(trx_amt)as avg_trx_amt,
sum(trx_amt)as total_trx_amt
from cmb_usr_trx_rcd
where mch_nm = '红玫瑰按摩保健休闲'
and year(trx_time) = 2024
and month(trx_time)= 9
group by trx_date
order by trx_date
2026-03-23 分组与聚合函数（1）Money全都花在哪，GroupBy来查一查  
select 
mch_nm,
sum(trx_amt) as sum_trx_amt
from cmb_usr_trx_rcd
where usr_id=5201314520 
and year(trx_time)=2024
group by mch_nm
order by sum_trx_amt desc
2026-03-23 条件过滤（3）Hour函数很给力，组合条件要仔细  
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) >= 22 or hour(trx_time) <= 5)
order by trx_time
2026-03-23 条件过滤（3）Hour函数很给力，组合条件要仔细  
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) >= 22 or hour(trx_time) <= 5
order by trx_time
2026-03-23 条件过滤（3）Hour函数很给力，组合条件要仔细  
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) >= 22 or hour(trx_time) <= 5
2026-03-23 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
order by trx_time
2026-03-23 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 '01:00:00' and '06:00:00'
order by trx_time
2026-03-23 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 6
order by trx_time
2026-03-23 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 6
2026-03-23 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
2026-03-23 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 trx_time between '2024-09-01'and '2024-09-30'
 order by trx_time
2026-03-23 HAVING-每次成绩都不低于80分的学生  
select student_id,max(score) max_score, min(score) min_score, avg(score) avg_score
from scores
group by student_id
having min(score)>=80
order by student_id