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提交日期 题目名称 提交代码
2026-02-20 表连接（1）你们难道都去过？那就试试用InnerJoin  
select distinct a.mch_nm 
from 
	cmb_usr_trx_rcd a
join 
	(select * from cmb_usr_trx_rcd 
 	where usr_id = '5201314520'
 		and year(trx_time) = '2024'
) b
	on a.mch_nm = b.mch_nm
where a.usr_id = '5211314521'
 and year(a.trx_time) = '2024'
order by a.mch_nm desc
2026-02-20 表连接（1）你们难道都去过？那就试试用InnerJoin  
select distinct a.mch_nm 
from 
	cmb_usr_trx_rcd a
join 
	(select * from cmb_usr_trx_rcd 
 	where usr_id = '5201314520'
 		and year(trx_time) = '2024'
) b
	on a.mch_nm = b.mch_nm
where a.usr_id = '5211314521'
 and year(a.trx_time) = '2024'
order by a.mch_nm desc
limit 5
2026-02-20 子查询（1）玩的最嗨那天在做甚？要用Where子查询  
select * from cmb_usr_trx_rcd
where usr_id = '5201314520'
	and year(trx_time) = '2024'
order by trx_amt desc
limit 1
2026-02-19 字符串与通配符（2）好多关键词做规则，可以使用rlike  
select 
	case when mch_nm like "%按摩保健休闲%" then '按摩保健休闲'
	when mch_nm regexp '按摩|保健|休闲|养生|SPA|会所' then '按摩、保健、休闲、养生、SPA、会所'
end as reg_rules,
count(distinct mch_nm) as mch_nm
from cmb_usr_trx_rcd 
where mch_nm like "%按摩保健休闲%"
	or mch_nm regexp '按摩|保健|休闲|养生|SPA|会所'
group by reg_rules
2026-02-19 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%'
2026-02-19 分类（1）姿势太多很过分，分类要用CaseWhen  
select 
	case when trx_amt=288 then '1.WithHand'
	when trx_amt=388 then '2.WithMimi'
when trx_amt=588 then '3.BlowJobbie'
when trx_amt=888 then '4.Doi'
when trx_amt=1288 then '5.DoubleFly'
else '6.other'
 end as ser_typ,
 count(mch_nm) as trx_cnt,
 min(date(trx_time)) 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
2026-02-19 分类（1）姿势太多很过分，分类要用CaseWhen  
select 
	case when trx_amt=288 then '1.WithHand'
	when trx_amt=388 then '2.WithMimi'
when trx_amt=588 then '3.BlowJobbie'
when trx_amt=888 then '4.Doi'
when trx_amt=1288 then '5.DoubleFly'
else '6.other'
 end as ser_typ,
 count(mch_nm) as trx_cnt,
 min(trx_time) 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
2026-02-19 分类（1）姿势太多很过分，分类要用CaseWhen  
select 
	case when trx_amt=288 then '1.WithHand'
	when trx_amt=388 then '2.WithMimi'
when trx_amt=588 then '3.BlowJobbie'
when trx_amt=888 then '4.Doi'
when trx_amt=1288 then '5.DoubleFly'
else '6.other'
 end as ser_typ,
 count(mch_nm) as trx_cnt,
 min(trx_time) as first_time
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
2026-02-19 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 trx_cnt,
min(trx_time) as first_time
from cmb_usr_trx_rcd 
where 
	usr_id = '5201314520'
	and trx_amt >= 288
group by usr_id,mch_nm
order by trx_cnt desc;
2026-02-19 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 usr_id = '5201314520' 
	and mch_nm = '红玫瑰按摩保健休闲'
2026-02-19 分组与聚合函数（5）想知道何时成瘾，用Max Or Min？  
select usr_id, trx_time, mch_nm from cmb_usr_trx_rcd 
where usr_id = '5201314520' 
	and mch_nm = '红玫瑰按摩保健休闲'
order by trx_time
limit 1
2026-02-19 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) as total_trx_cnt,
count(distinct usr_id) as unique_usr_cnt,
count(1) / count(distinct usr_id) as avg_trx_per_user
from cmb_usr_trx_rcd 
where 
	date(trx_time) between '2023-01-01' and '2024-06-30'
and mch_nm = '红玫瑰按摩保健休闲'
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2026-02-19 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(mch_nm) as trc_cnt
from cmb_usr_trx_rcd 
where 
	year(trx_time) = 2024
	and month(trx_time) in (1,2,3,4,5,6,7)
	and mch_nm = '红玫瑰按摩保健休闲'
group by trx_amt
order by trc_cnt desc
limit 5;
2026-02-19 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(1) as trc_cnt
from cmb_usr_trx_rcd 
where 
	month(trx_time) in (1,2,3,4,5,6,7)
	and mch_nm = '红玫瑰按摩保健休闲'
group by trx_amt
order by trc_cnt desc
limit 5;
2026-02-19 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 
	date(trx_time) between '2024-09-01' and '2024-09-30'
and mch_nm = '红玫瑰按摩保健休闲'
group by date(trx_time)
order by trx_date
2026-02-19 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 
	trx_time between '2024-09-01' and '2024-09-30'
and mch_nm = '红玫瑰按摩保健休闲'
group by date(trx_time)
order by trx_date
2026-02-19 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
2026-02-19 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) between 0 and 5)
	)
 order by trx_time
2026-02-19 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
2026-02-19 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'