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2024-11-17 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 as asshole_tried_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 mch_nm         
from cmb_usr_trx_rcd            
where 
    year(trx_time) in (2023, 2024)  
    and usr_id = '5211314521'
group by mch_nm) b    
on a.mch_nm = b.mch_nm 
order by 2 desc
2024-11-17 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 as asshole_tried_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
2024-11-17 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
2024-11-17 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 as asshole_tried_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
2024-11-17 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 as asshole_tried_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
2024-11-17 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 as asshole_tried_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
2024-11-17 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select b.mch_nm
from 
(select distinct mch_nm
 from cmb_usr_trx_rcd 
 where usr_id='5201314520'
 and year(trx_time) between 2023 and 2024
and trx_amt>=30)a
 left join
 (select distinct mch_nm
 from cmb_usr_trx_rcd 
 where usr_id='5201314521'
 and year(trx_time) between 2023 and 2024)b
 on a.mch_nm!=b.mch_nm
2024-11-17 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'
 andyear(trx_time)=2024)a
inner join
 (select distinct mch_nm
 from cmb_usr_trx_rcd
 where usr_id='5211314521'
 andyear(trx_time)=2024)b
on a.mch_nm=b.mch_nm
order by 1 desc
2024-11-17 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)
2024-11-17 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(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 1
2024-11-04 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%'
2024-11-04 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 ser_typ
order by 1
2024-10-31 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%'
2024-10-31 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 ser_typ
order by 1
2024-10-31 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 ser_typ
order by 1
2024-10-31 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
ser_typ
order by 1
2024-10-31 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
ser_typ
order by 1
2024-10-31 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 
 mch_nm
order by 4 desc
2024-10-31 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 
 usr_id= '5201314520'
 and mch_nm = '红玫瑰按摩保健休闲'
2024-10-30 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 
usr_id= '5201314520'
and mch_nm = '红玫瑰按摩保健休闲'