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提交日期 题目名称 提交代码
2026-08-14 字符串与通配符（1）名称里面有特服，可以使用通配符  
select
count(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%'
;
2026-08-14 分组与聚合函数（6）想知道渣男有多坏，疯狂使用GroupBy  
select 
usr_id,
mch_nm,
sum(trx_amt) as trx_amt,
count(1) as trxz_cnt,
min(trx_time) as first_time
from cmb_usr_trx_rcd 
where 
trx_amt >= 288
and usr_id =5201314520
group by mch_nm
;
2026-08-14 分组与聚合函数（5）想知道何时成瘾，用Max Or Min？  
select 
usr_id,
min(trx_time) as first_time,
mch_nm
from cmb_usr_trx_rcd 
where 
mch_nm ='红玫瑰按摩保健休闲'
and usr_id=5201314520
;
2026-08-14 分组与聚合函数（3）五花八门的项目，其实都有固定套路（1）  
selecttrx_amt,
count(1) as trx_cnt
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) in (1,2,3,4,5,6,7)
group by trx_amt
order by trx_cnt desc
limit 5;
2026-08-14 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 sum_trx_amt
from cmb_usr_trx_rcd 
where mch_nm = '红玫瑰按摩保健休闲'
and date(trx_time) between '2024-09-01' and '2024-09-30'
group by date(trx_time)
order by trx_date
;
2026-08-14 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 sum_trx_amt
from cmb_usr_trx_rcd 
where mch_nm = '红玫瑰按摩保健休闲'
and date(trx_time) between '2024-09-01' and '2024-09-30'
group by date(trx_time)
;
2026-08-14 分组与聚合函数（2）擦边营收怎么样，聚合函数可看出  
select 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 sum_trx_amt
from cmb_usr_trx_rcd 
where mch_nm = '红玫瑰按摩保健休闲'
and month(trx_time) = 9
;
2026-08-14 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 year(trx_time) = 2024
and usr_id=5201314520
group by mch_nm
;
2026-08-14 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 date(trx_time) between '2024-09-01' and '2024-09-30' 
and (hour(trx_time) >= '22'
or hour(trx_time) between '0' and '5')
and usr_id=5201314520
order by trx_time;
2026-08-14 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 date(trx_time) between '2024-09-01' and '2024-09-30' 
and (hour(trx_time) >= '22'
or hour(trx_time) between '0' and '5')
and usr_id=5201314520
order by trx_time
limit 5;
2026-08-14 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 date(trx_time) between '2024-09-01' and '2024-09-30' 
and (hour(trx_time) >= '22'
or hour(trx_time) between '0' and '5')
and usr_id=5201314520
limit 5;