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评论笔记

评论日期 题目名称 评论内容 站长评论
2024-11-25 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
用trx_cnt排序,你trx_amt了
啥也没说
2024-11-25 分组与聚合函数(5)五花八门的项目,其实都有固定套路(2) 
第一条的时间,后面and .....直接用or连接了,没有()起来。第二条,and 里面的or外面被()起来了。
啥也没说
2024-11-25 分组与聚合函数(3)五花八门的项目,其实都有固定套路(1) 
hhh
经常去的朋友都知道😊

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提交日期 题目名称 提交代码
2024-11-25 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
2024-11-25 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 and usr_id='5201314520')b
on a.mch_nm = b.mch_nm
order by 1 desc
2024-11-25 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%'
2024-11-25 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 ser_typ
2024-11-25 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 first_time
from cmb_usr_trx_rcd
where usr_id='5201314520' and trx_amt >= 288
group by usr_id,mch_nm
order bytrx_cnt desc
2024-11-25 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
	mch_nm='红玫瑰按摩保健休闲' and usr_id='5201314520'
order by
	usr_id,mch_nm
2024-11-25 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
	mch_nm='红玫瑰按摩保健休闲' and usr_id='5201314520'
order by
	usr_id
2024-11-25 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) as total_trx_cnt, 
    count(distinct usr_id) as unique_usr_cnt, 
    count(1) / 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( 
(year(trx_time) = 2023 and month(trx_time) between 1 and 12) 
or (year(trx_time) = 2024 and month(trx_time) between 1 and 6)
)
group by
    trx_amt 
order by
    avg_trx_per_user desc 
limit 5;
2024-11-25 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(*) 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
2024-11-25 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
2024-11-25 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
limit 5
2024-11-25 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) as trx_date,
max(trx_amt) as max_trx_amt,
min(trx_amt) as min_trx_amt,
avg(trx_amt) as avg_trx_amt,
sum(trx_amt) as total_trx_amt 
from cmb_usr_trx_rcd 
where 
mch_nm='红玫瑰按摩保健休闲' and
trx_time like '2024-09%'
group by date(trx_time)
order by date(trx_time)
2024-11-25 分组与聚合函数(1)Money全都花在哪,GroupBy来查一查 
select 
    mch_nm,
    sum(trx_amt) as sum_trx_amt
from 
    cmb_usr_trx_rcd 
where 
    year(trx_time) = 2024 
    and usr_id = '5201314520' 
group by 
    mch_nm 
order by 
    sum_trx_amt desc
2024-11-25 条件过滤(3)Hour函数很给力,组合条件要仔细 
select * from cmb_usr_trx_rcd where usr_id='5201314520'
and date(trx_time) between '2024-09-01' and '2024-09-30'
and (hour(trx_time) between 22 and 23
or hour(trx_time) between 0 and 5)
order by trx_time
2024-11-25 条件过滤(2)半夜活动有猫腻,Hour函数给给力 
select * from cmb_usr_trx_rcd where usr_id='5201314520' and 
date(trx_time) between '2024-09-01' and '2024-09-30' 
and hour(trx_time) between '1' and '5'
 order by trx_time
2024-11-25 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select
    *
from
    cmb_usr_trx_rcd  
where
    date(trx_time)  
    between '2024-09-01' and '2024-09-30' 
    and usr_id = '5201314520'  
order by
    trx_time
2024-11-25 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select * from cmb_usr_trx_rcdwhere usr_id='5201314520' and date(trx_time) between '2024-09-01' and '2024-09-30' order by trx_time
2024-11-25 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select * from cmb_usr_trx_rcdwhere usr_id='5201314520' and date(trx_time) between '2024-09-01' and '2024-09-30'