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2025-03-21 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
WITH etc AS (
SELECT 
mch_nm,
COUNT(*) AS trx_cnt
FROM cmb_usr_trx_rcd 
WHERE 
usr_id = 5201314520 
AND YEAR(trx_time) IN (2023, 2024)
GROUP BY mch_nm
HAVING COUNT(*) >= 20
),
ds AS (
SELECT 
 distinct
mch_nm
FROM cmb_usr_trx_rcd 
WHERE
usr_id = 5211314521 
AND YEAR(trx_time) IN (2023, 2024)
)
SELECT 
e.mch_nm AS asshole_tried,
e.trx_cnt,
d.mch_nm as darling_tried
FROM etc e
LEFT JOIN ds d 
ON e.mch_nm = d.mch_nm
ORDER BY e.trx_cnt DESC;
2025-03-21 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
WITH etc AS (
SELECT 
mch_nm,
COUNT(*) AS trx_cnt
FROM cmb_usr_trx_rcd 
WHERE 
usr_id = 5201314520 
AND YEAR(trx_time) IN (2023, 2024)
GROUP BY mch_nm
HAVING COUNT(*) >= 20
),
ds AS (
SELECT 
mch_nm AS darling_tried
FROM cmb_usr_trx_rcd 
WHERE
usr_id = 5211314521 
AND YEAR(trx_time) IN (2023, 2024)
)
SELECT 
e.mch_nm AS asshole_tried,
e.trx_cnt,
d.darling_tried
FROM etc e
LEFT JOIN ds d 
ON e.mch_nm = d.darling_tried
ORDER BY e.trx_cnt DESC;
2025-03-21 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
with etc as(
 select 
 mch_nm,
 count(*) 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
),
ds as(
select mch_nm as darling_triedfrom cmb_usr_trx_rcd 
where
usr_id=5211314521 
and Year(trx_time) in (2023,2024)
) 
select e.mch_nm as asshole_tried,e.trx_cnt,d.darling_tried 
from etc e left join ds d 
on e.mch_nm = d.darling_tried
ORDER BY e.trx_cnt DESC;
2025-03-21 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
with etc as(
 select 
 mch_nm,
 count(*) 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
),
ds as(
select mch_nm as darling_triedfrom cmb_usr_trx_rcd 
where
usr_id=5211314521 
and Year(trx_time) in (2023,2024)
) 
select e.mch_nm as asshole_tried,e.trx_cnt,d.darling_tried 
from etc e left join ds d 
on e.mch_nm = d.darling_tried
WHERE d.darling_tried IS NULL
ORDER BY e.trx_cnt DESC;
2025-03-20 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 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
 mch_nm like '%按摩保健休闲%' or
 mch_nm rlike '.*(按摩|保健|休闲|养生|SPA|会所).*'
group by reg_rules
order by mch_cnt desc
2025-03-20 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) as mch_cnt from cmb_usr_trx_rcd where mch_nm like '%按摩保健休闲%';
2025-03-20 字符串与通配符（1）名称里面有特服，可以使用通配符  
select distinct mch_nm from cmb_usr_trx_rcd where mch_nm like '%按摩保健休闲%';
2025-03-20 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(*) 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
2025-03-20 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(*) as trx_cnt,
min(trx_time) as frist_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
2025-03-20 分组与聚合函数（6）想知道渣男有多坏，疯狂使用GroupBy  
select 
	*
from cmb_usr_trx_rcd where usr_id = 5201314520 and trx_amt >=288
2025-03-18 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=5201314520 
and Year(trx_time) = 2024
and mch_nm in (
selectmch_nm from cmb_usr_trx_rcd where 
usr_id=5211314521 
and Year(trx_time) = 2024
)
group by mch_nm
2025-03-18 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 in(
	select Max(trx_amt) from cmb_usr_trx_rcd where
	Year(trx_time) = 2024 
	and usr_id = 5201314520
)
2025-03-18 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 mch_nm like '%按摩保健休闲%' or lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*'
group by reg_rules
order by mch_cnt desc
2025-03-18 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) from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲'
2025-03-18 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(*) 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 asc
2025-03-18 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(*) 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 asc
2025-03-18 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(*) 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
2025-03-18 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(*) trx_cnt,
 	min(date(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
2025-03-18 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(*) trx_cnt,
 min(date(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
2025-03-18 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(*) trx_cnt,
 min(date(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 4 desc