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2024-11-08 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
SELECT
a.mch_nm AS asshole_tried,
a.mch_amt AS asshole_tried_cnt,
b.mch_nm AS darling_tried
FROM (
SELECT DISTINCT mch_nm, COUNT(1) AS mch_amt
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520' AND YEAR(trx_time) IN (2023, 2024)
GROUP BY mch_nm
HAVING mch_amt > 20
) a
LEFT JOIN (
SELECT DISTINCT mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5211314521' AND YEAR(trx_time) IN (2023, 2024)
) b
ON a.mch_nm = b.mch_nm
ORDER BY asshole_tried_cnt DESC;
2024-11-08 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select 
    a.mch_nm as asshole_tried,  
    a.trx_cnt,                  
    b.mch_nm as darling_tried   
from 
(select 
    mch_nm,                     
    count(1) trx_cnt            
from cmb_usr_trx_rcd            
where 
    year(trx_time) in (2023, 2024)  
    and usr_id = '5201314520'   
group by mch_nm                 
having count(1) >= 20) a        
left join 
(select distinct mch_nm         
from cmb_usr_trx_rcd            
where 
    year(trx_time) in (2023, 2024)  
    and usr_id = '5211314521') b    
on a.mch_nm = b.mch_nm 
order by 2 desc
2024-11-08 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select
a.mch_nm asshole_tried
,a.mch_amt asshole_tried_cnt
,b.mch_nm darling_tried
from (
select mch_nm,count(1) mch_amt
from cmb_usr_trx_rcd
where usr_id='5201314520' and year(trx_time) in (2023, 2024)
group by mch_nm
having mch_amt>20
) a
left join(
select distinct mch_nm from cmb_usr_trx_rcd
where usr_id='5211314521' and year(trx_time) in (2023, 2024)) b
on a.mch_nm=b.mch_nm
order by asshole_tried_cnt desc
2024-11-08 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select
a.mch_nm asshole_tried
,a.mch_amt asshole_tried_cnt
,b.mch_nm darling_tried
from (
select distinct mch_nm,count(1) mch_amt
from cmb_usr_trx_rcd
where usr_id='5201314520' and year(trx_time) in (2023, 2024)
group by mch_nm
having mch_amt>20
) a
left join(
select distinct mch_nm from cmb_usr_trx_rcd
where usr_id='5211314521' and year(trx_time) in (2023, 2024)) b
on a.mch_nm=b.mch_nm
order by asshole_tried_cnt desc
2024-11-08 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select
a.mch_nm asshole_tried
,a.mch_amt asshole_tried_cnt
,b.mch_nm darling_tried
from (
select distinct mch_nm,count(1) mch_amt
from cmb_usr_trx_rcd
where usr_id='5201314520' and date(trx_time) between '2023-01-01' and '2024-12-31'
group by mch_nm
having mch_amt>20
) a
left join(
select distinct mch_nm from cmb_usr_trx_rcd
where usr_id='5211314521' and date(trx_time) between '2023-01-01' and '2024-12-31') b
on a.mch_nm=b.mch_nm
order by asshole_tried_cnt desc
2024-11-08 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 cmb_usr_trx_rcd b
ON a.mch_nm = b.mch_nm
WHERE a.usr_id = '5201314520'
AND b.usr_id = '5211314521'
ORDER BY a.mch_nm;
2024-11-07 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.*
from
(select distinct mch_nm from cmb_usr_trx_rcd
where usr_id='5201314520') a
inner join
(select distinct mch_nm from cmb_usr_trx_rcd
where usr_id='5211314521') b
on a.mch_nm=b.mch_nm
order by mch_nm
2024-11-07 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.*
from
(select distinct mch_nm from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5201314520') a
inner join
(select distinct mch_nm from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5211314521') b
on a.mch_nm=b.mch_nm
order by mch_nm
2024-11-07 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.*
from
(select distinct mch_nm from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5201314520') a
inner join
(select distinct mch_nm from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5211314521') b
on a.mch_nm=b.mch_nm
2024-11-07 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
)
2024-11-07 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%'
2024-11-07 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
,date(min(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 1
order by 1
2024-11-07 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(1) as trx_cnt
,min(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 1
order by 1
2024-11-07 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.DobleFly'
 else '6.other'
 end ser_typ
,count(1) trx_cnt
,min(date(trx_time)) 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
2024-11-07 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(1) trx_cnt
,min(trx_time) first_time
from cmb_usr_trx_rcd
where 
	usr_id='5201314520'
and
trx_amt>=288
group by mch_nm,usr_id
order by trx_cnt desc
2024-11-07 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 usr_id='5201314520'
	and mch_nm='红玫瑰按摩保健休闲'
group by
	usr_id,mch_nm;
2024-11-07 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
2024-11-07 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 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
2024-11-07 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 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
2024-11-07 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 date(trx_time) between '2024-09-01' and '2024-09-30'
group by date(trx_time)
order by trx_date