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2024-11-14 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.trx_cnt asshole_tried_cnt,b.mch_nm 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 
    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 a.trx_cnt desc
2024-11-14 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.trx_cnt asshole_tried_cnt,b.mch_nm 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 
    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
2024-11-14 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select a.mch_nm,a.trx_cnt ,b.mch_nm 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 
    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
2024-11-14 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.mch_nm from 
(select distinct mch_nm
from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5211314521')a
inner join
(select distinct mch_nm
from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5201314520')b
on a.mch_nm = b.mch_nm order by 1 desc
2024-11-14 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.mch_nm from 
(select distinct mch_nm
from cmb_usr_trx_rcd
where usr_id='5211314521')a
inner join
(select distinct mch_nm
from cmb_usr_trx_rcd
whereusr_id='5201314520')b
on a.mch_nm = b.mch_nm order by 1 desc
2024-11-14 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='5211314521')a
inner join
(select distinct mch_nm
from cmb_usr_trx_rcd
where year(trx_time)=2024 or usr_id='5201314520')b
on a.mch_nm = b.mch_nm order by 1 desc
2024-11-14 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='5211314521')a
inner join
(select distinct mch_nm
from cmb_usr_trx_rcd
where month(trx_time)=2024 or usr_id='5201314520')b
on a.mch_nm != b.mch_nm order by 1 desc
2024-11-14 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='5211314521')a
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where month(trx_time)=2024 or usr_id='5201314520')b
on a.mch_nm != b.mch_nm order by 1 desc
2024-11-14 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)
2024-11-14 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%'
2024-11-14 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%'
2024-11-14 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' and trx_amt>=288
group by trx_amt
order by trx_cnt
2024-11-14 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
,max(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 trx_amt
order by trx_cnt
2024-11-14 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
selectusr_id,mch_nm,sum(trx_amt) trx_amt,count(trx_amt) trx_cnt ,min(trx_time) first_time from cmb_usr_trx_rcd 
where trx_amt>=288 and usr_id=5201314520
group by mch_nm
order by trx_cnt DESC
2024-11-14 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
2024-11-14 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(usr_id) total_trx_cnt ,count(distinct usr_id ) unique_usr_cnt ,count(usr_id)/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
2024-11-14 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(usr_id),count(distinct usr_id ),count(usr_id)/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
2024-11-14 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) trx_cntfrom cmb_usr_trx_rcd 
where mch_nm='红玫瑰按摩保健休闲' and date(trx_time) between '2024-01-01' and '2024-07-31'
group by trx_amt
order by trx_cnt desc
limit 5
2024-11-14 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) cnt from cmb_usr_trx_rcd 
where mch_nm='红玫瑰按摩保健休闲' and date(trx_time) between '2024-01-01' and '2024-07-31'
group by trx_amt
order by cnt desc
limit 5
2024-11-14 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) cnt from cmb_usr_trx_rcd 
where mch_nm='红玫瑰按摩保健休闲'
group by trx_amt
order by cnt desc
limit 5