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2024-11-24 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, b.mch_nm darling_tried
from
(select mch_nm,count(mch_nm) trx_cnt 
from cmb_usr_trx_rcd
where usr_id='5201314520'and(year(trx_time) in (2023,2024))
group by mch_nm
having count(mch_nm)>=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
using (mch_nm)
order by trx_cnt desc
2024-11-24 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,
count(a.trx_amt) as trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5211314521'
 and (year(b.trx_time) = '2024'or year(b.trx_time)='2023')
where a.usr_id = '5201314520'
and (year(a.trx_time) = '2024' or year(a.trx_time)='2023')
group by a.mch_nm, b.mch_nm
having count(a.mch_nm) >= 20
order by trx_cnt desc;
2024-11-24 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,
count(a.trx_amt) as trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5211314521'
 and (year(b.trx_time) = '2024'or year(b.trx_time)='2023')
where a.usr_id = '5201314520'
and (year(a.trx_time) = '2024' or year(a.trx_time)='2023')
group by a.mch_nm, b.mch_nm
having count(a.trx_amt) >= 20
order by trx_cnt desc;
2024-11-24 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,
count(a.trx_amt) as asshole_trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5211314521'
 and (year(b.trx_time) = '2024'or year(b.trx_time)='2023')
where a.usr_id = '5201314520'
and (year(a.trx_time) = '2024' or year(a.trx_time)='2023')
group by a.mch_nm, b.mch_nm
having count(a.trx_amt) >= 20
order by asshole_trx_cnt desc;
2024-11-24 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,
count(a.trx_amt) as asshole_trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5201314521'
 and (year(b.trx_time) = '2024'or year(b.trx_time)='2023')
where a.usr_id = '5201314520'
and (year(a.trx_time) = '2024' or year(a.trx_time)='2023')
group by a.mch_nm, b.mch_nm
having count(a.trx_amt) >= 20
order by asshole_trx_cnt desc;
2024-11-24 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,
count(a.trx_amt) as asshole_trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5201314521'
 and year(b.trx_time) = '2024'
where a.usr_id = '5201314520'
and year(a.trx_time) = '2024'
group by a.mch_nm, b.mch_nm
having count(a.trx_amt) >= 20
order by asshole_trx_cnt desc;
2024-11-24 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,
count(a.trx_amt) as trx_cnt,
b.mch_nm as darling_tried
from cmb_usr_trx_rcd a
left join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
 and b.usr_id = '5201314521'
 and year(b.trx_time) = '2024'
where a.usr_id = '5201314520'
and year(a.trx_time) = '2024'
group by a.mch_nm, b.mch_nm
having count(a.trx_amt) >= 20
order by trx_cnt desc;
2024-11-24 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
inner join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
where a.usr_id = '5201314520'
and b.usr_id = '5211314521'
and year(a.trx_time) = 2024
and year(b.trx_time) = 2024
order by a.mch_nm desc;
2024-11-24 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.mch_nm
from cmb_usr_trx_rcd a
inner join cmb_usr_trx_rcd b
on a.mch_nm = b.mch_nm
where a.usr_id = '5201314520'
and b.usr_id = '5211314521'
and year(a.trx_time) = 2024
and year(b.trx_time) = 2024
order by a.mch_nm desc;
2024-11-24 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
select usr_id, mch_nm, trx_time, trx_amt from cmb_usr_trx_rcd 
where usr_id='5201314520'
and trx_amt=(
select max(trx_amt) 
from cmb_usr_trx_rcd
where usr_id='5201314520'
and year(trx_time)='2024')
2024-11-24 字符串与通配符(1)名称里面有特服,可以使用通配符 
select count(distinct(mch_nm)) as mch_cnt 
from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%'
2024-11-24 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=668 then '4.Doi'
when trx_amt=888 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 1
2024-11-24 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 usr_id='5201314520'
and mch_nm='红玫瑰按摩保健休闲'
group by ser_typ
order by 1
2024-11-24 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 1
2024-11-24 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_amt) 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, usr_id
order by trx_cnt desc
2024-11-24 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_amt) 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, usr_id
order by trx_cnt desc
limit 5
2024-11-24 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_amt) 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 trx_cnt desc
limit 5
2024-11-24 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_amt) as trx_cnt,
min(trx_time) as first_time from cmb_usr_trx_rcd 
where usr_id='5201314520'
group by mch_nm
order by trx_cnt desc
limit 5
2024-11-24 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'
2024-11-24 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) between '2023-01-01' and '2024-06-30'
group by trx_amt
order by avg_trx_per_user desc
limit 5