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2026-01-06 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
select
	distinct zha.asshole_tried,
zha.trx_cnt,
boy.darling_tried
from
(
select
	mch_nm as asshole_tried,
count(trx_amt) as trx_cnt
from
	cmb_usr_trx_rcd
where 
	usr_id = '5201314520'
	and year(trx_time) in (2023,2024)
group by 
	mch_nm
	having trx_cnt >= 20
 ) zha
left join 
(
select 
	mch_nm as darling_tried
from
	cmb_usr_trx_rcd
where
	usr_id = '5211314521'
and
	year(trx_time) in (2023,2024)
) boy
on
	boy.darling_tried = zha.asshole_tried
order by trx_cnt desc
2026-01-06 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
select
	zha.asshole_tried,
zha.trx_cnt,
boy.darling_tried
from
(
select
	mch_nm as asshole_tried,
count(trx_amt) as trx_cnt
from
	cmb_usr_trx_rcd
where 
	usr_id = '5201314520'
	and year(trx_time) in (2023,2024)
group by 
	mch_nm
	having trx_cnt >= 20
 ) zha
left join 
(
select 
	mch_nm as darling_tried
from
	cmb_usr_trx_rcd
where
	usr_id = '5211314521'
and
	year(trx_time) in (2023,2024)
) boy
on
	boy.darling_tried = zha.asshole_tried
order by trx_cnt desc
2026-01-06 表连接（1）你们难道都去过？那就试试用InnerJoin  
SELECT 
	DISTINCT a1.mch_nm
FROM 
(
SELECT *
FROM 
	cmb_usr_trx_rcd
WHERE 
	usr_id = '5201314520'
AND
	year(trx_time) = 2024
)a1
JOIN
(
SELECT *
FROM 
	cmb_usr_trx_rcd
WHERE 
	usr_id = '5211314521'
AND
	year(trx_time) = 2024
 )b1
ON
	a1.mch_nm = b1.mch_nm
ORDER BY
	a1.mch_nm desc
2025-12-29 WHERE子查询 + 比较运算符  
select 
	usr_id,
mch_nm,
trx_time,
trx_amt
from
	cmb_usr_trx_rcd
where 
	trx_amt > (select avg(trx_amt) from cmb_usr_trx_rcd)
2025-12-29 基础标量子查询-不带分组  
select 
	usr_id,
mch_nm,
trx_time,
trx_amt,
(select avg(trx_amt)from cmb_usr_trx_rcd) as avg_trx_amt
from cmb_usr_trx_rcd
where usr_id = '5201314520'
2025-12-29 基础标量子查询-带分组  
select usr_id, sum(trx_amt),
(select avg(trx_amt)
from cmb_usr_trx_rcd)as platform_avg_amt
from cmb_usr_trx_rcd
group by usr_id
2025-12-29 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
)
2025-12-24 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 like '%按摩%' or mch_nm like '%保健%'
or mch_nm like '%休闲%' or mch_nm like '%养生%' 
or mch_nm like '%SPA%' or mch_nm like '%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 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
order by mch_cnt desc;
2025-12-24 字符串与通配符（1）名称里面有特服，可以使用通配符  
selectcount(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-24 字符串与通配符（1）名称里面有特服，可以使用通配符  
select count(mch_nm) as mch_cnt
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-24 字符串与通配符（1）名称里面有特服，可以使用通配符  
select count(mch_nm)
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-23 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(trx_amt) 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 ser_typ
2025-12-23 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(mch_nm)as trx_cnt,
min(trx_time)as first_time
from cmb_usr_trx_rcd
where usr_id = '5201314520'
and trx_amt >= 288
group by mch_nm
having usr_id = '5201314520'
order by trx_cnt desc
2025-12-23 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(mch_nm)as trx_cnt,
min(trx_time)as first_time
from cmb_usr_trx_rcd
where usr_id = '5201314520'
and trx_amt >= 288
group by mch_nm
having usr_id = '5201314520'
order by trx_cnt desc
limit 5;
2025-12-23 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(mch_nm)as trx_cnt,
min(date(trx_time))as first_time
from cmb_usr_trx_rcd
where usr_id = '5201314520'
and trx_amt >= 288
group by mch_nm
having usr_id = '5201314520'
order by trx_cnt desc
limit 5;
2025-12-23 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'
group by usr_id
having usr_id = '5201314520';
2025-12-23 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(trx_amt) as total_trx_cnt,
count(distinct usr_id) as unique_usr_cnt,
(count(trx_amt) / count(distinct usr_id)) as 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) >= '2023-01-01'
and date(trx_time) < '2024-07-01'
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2025-12-23 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(trx_amt) as total_trx_cnt,
count(distinct usr_id) as unique_usr_cnt,
(count(trx_amt) / count(distinct usr_id)) as avg_trx_per_user
from cmb_usr_trx_rcd 
where date(trx_time) >= '2023-01-01'
and date(trx_time) < '2024-07-01'
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2025-12-23 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 any_value(trx_amt) as 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 date(trx_time) >= '2024-01-01'
and date(trx_time) < '2024-08-01'
group by trx_amt
order by trx_cnt desc
limit 5;
2025-12-23 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 any_value(trx_amt) as trx_amt,
count(trx_amt) as trx_cnt, mch_nm
from cmb_usr_trx_rcd
where mch_nm = '红玫瑰按摩保健休闲'
and date(trx_time) >= '2024-01-01'
and date(trx_time) < '2024-08-01'
group by trx_amt
order by trx_cnt desc
limit 5;