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提交日期 题目名称 提交代码
2025-01-20 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) 'mch_cnt' from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%'
2025-01-17 分类(1)姿势太多很过分,分类要用CaseWhen 
select 
	case trx_amt
when 288 then '1.WithHand'
when 388 then '2.WithMimi'
when 588 then '3.BlowJobbie'
when 888 then '4.Doi'
when 1288 then '5.DoubleFly'
else '6.other'
end as 'ser_typ',
count(1) as 'trx_cnt',
DATE_FORMAT(min(trx_time),'%Y-%m-%d') as 'first_date'
from cmb_usr_trx_rcd 
where mch_nm='红玫瑰按摩保健休闲' and usr_id='5201314520'
group by ser_typ
order by ser_typ
2025-01-17 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) 'trx_amt', count(trx_amt) 'trx_cnt', min(trx_time) 'first_time' from cmb_usr_trx_rcd 
where usr_id=5201314520 and trx_amt >= '288'
group by mch_nm
order by trx_cnt desc
2025-01-17 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) '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
2024-11-22 分组与聚合函数(5)五花八门的项目,其实都有固定套路(2) 
select trx_amt,count(1) 'total_trx_cnt',count(distinct usr_id) 'unique_usr_cnt',count(1)/count(distinct usr_id) 'avg_trx_per_user'
from cmb_usr_trx_rcd 
where mch_nm = '红玫瑰按摩保健休闲'
and date(trx_time) between '2023-01-01' and '2024-06-30'
group by trx_amt
order by avg_trx_per_user desc
limit 5
2024-11-22 分组与聚合函数(3)五花八门的项目,其实都有固定套路(1) 
select trx_amt, count(*) '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) between 1 and 7
group by trx_amt
order by trx_cnt desc
limit 5
2024-11-22 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) 'trx_date',max(trx_amt) 'max_trx_amt', min(trx_amt) 'min_trx_amt',avg(trx_amt) 'avg_trx_amt',sum(trx_amt) '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) = 09
group by date(trx_time) 
order by trx_date
2024-11-22 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) 'trx_date',max(trx_amt) 'max_trx_amt', min(trx_amt) 'min_trx_amt',avg(trx_amt) 'avg_trx_amt',sum(trx_amt) 'sum_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) = 09
group by date(trx_time) 
order by trx_date
2024-11-22 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) '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
2024-11-22 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) from cmb_usr_trx_rcd
where usr_id = '5201314520'
and year(trx_time) = '2024'
group by mch_nm
order by sum(trx_amt) desc
2024-11-22 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) between 0 and 5
or hour(trx_time) between 22 and 24)
and usr_id = '5201314520'
order by trx_time
2024-11-22 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) between 1 and 5
or hour(trx_time) between 22 and 24)
and usr_id = '5201314520'
order by trx_time
2024-11-22 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
2024-11-22 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
2024-11-22 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'
anddate(trx_time) between '2024-09-01' and '2024-09-30'
order by trx_time