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2026-03-15 表连接(1)你们难道都去过?那就试试用InnerJoin 
select 
mch_nm
from
cmb_usr_trx_rcd
where 
 usr_id in (5201314520,5211314521)
 and year(trx_time) = 2024
group by mch_nm
having count(distinct usr_id) = 2
2026-03-13 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 
 trx_amt = (
select max(trx_amt)
from cmb_usr_trx_rcd
where usr_id = '5201314520'
 and year (trx_time) = 2024
 )
 and usr_id = '5201314520'
 and year(trx_time) = 2024
2026-03-13 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 lower(mch_nm) rlike '.*(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_cnt
from 
cmb_usr_trx_rcd
where lower(mch_nm) rlike '.*(按摩|保健|休闲|养生|SPA|会所).*'
 or mch_nm like '%按摩保健休闲%'
group by
reg_rules
order by 
mch_cnt desc;
2026-03-13 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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*' then '按摩、保健、休闲、spa、养生、会所'
 end as reg_rules,
count(distinct mch_nm) as mch_cnt
from 
cmb_usr_trx_rcd
where lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*'
 or mch_nm like '%按摩保健休闲%'
group by
reg_rules
order by 
mch_cnt desc;
2026-03-13 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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*' then '按摩、保健、休闲、spa、养生、会所'
 end as reg_rules,
count(distinct mch_nm) as mch_cnt
from 
cmb_usr_trx_rcd
where lower(mch_nm) rlike '.*(按摩|保健|休闲|养生|spa|会所).*'
 or mch_nm like '%按摩保健休闲%'
group by
reg_rules
order by 
mch_cnt desc;
2026-03-13 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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*' then '按摩、保健、休闲、养生、spa、会所'
 end as reg_rules,
count(distinct mch_nm) as mch_cnt
from 
cmb_usr_trx_rcd
where lower(mch_nm) rlike '.*(按摩|保健|休闲|养生|spa|会所).*'
 or mch_nm like '%按摩保健休闲%'
group by
reg_rules
order by 
mch_cnt desc;
2026-03-13 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%'
2026-03-13 字符串与通配符(1)名称里面有特服,可以使用通配符 
select 
count(1) as mch_cnt
from
cmb_usr_trx_rcd
where
 mch_nm like '%按摩保健休闲%'
2026-03-13 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,
 min(date(trx_time)) as first_date
from 
cmb_usr_trx_rcd
where 
usr_id = '5201314520'
and mch_nm = '红玫瑰按摩保健休闲'
group by 
ser_typ
order by
1;
2026-03-13 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,
 min(date(trx_time)) as first_date
from 
cmb_usr_trx_rcd
where 
usr_id = '5201314520'
and mch_nm = '红玫瑰按摩保健休闲'
group by 
ser_typ
order by
1;
2026-03-13 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_amt desc;
2026-03-12 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
 ((year(trx_time) = 2023 and month(trx_time) between 1 and 12 )
 or (year(trx_time) = 2024 and month(trx_time) between 1 and 6))
 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
2026-03-12 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
 (year(trx_time) = 2023 and month(trx_time) in (1,2,3,4,5,6,7,8,9,10,11,12))
 or (year(trx_time) = 2024 and month(trx_time) in (1,2,3,4,5,6))
group by 
 trx_amt
order by
 avg_trx_per_user desc 
limit 5
2026-03-12 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_amt) 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;
2026-03-12 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;
2026-03-12 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
order by sum_trx_amt desc
2026-03-12 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
order by
sum_trx_amt desc
2026-03-12 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
2026-03-12 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 22 and 5 )and usr_id = 5201314520
2026-03-11 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