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勋章 ①金银铜：在竞赛中获得第一二三名；②好习惯：自然月10天提交；③里程碑：解决1/2/5/10/20/50/100/200题；④每周打卡挑战：完成每周5题，每年1月1日清零。

达成1题里程碑2024-12-02
达成2题里程碑2024-12-02
达成5题里程碑2024-12-02
达成10题里程碑2024-12-03
达成20题里程碑2024-12-07
完成w10打卡2024-12-02

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评论日期 题目名称 评论内容 站长评论
2024-12-04 时间日期（2）按月统计日花费，一天都不要浪费  
select trx_mon,last_day,day(last_day) as days_of_mon
from (select DATE_FORMAT(date(trx_time),'%Y-%m') as trx_mon, last_day(trx_time) as last_day
	from cmb_usr_trx_rcd
	where usr_id=5201314520 and year(trx_time) in (2023,2024)
	group by trx_mon,last_day
	order by trx_mon) a
哪里有bug呀，提交不通过呢，运行得出的结果也正常
 
啥也没说

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提交日期 题目名称 提交代码
2024-12-22 字符串与通配符（2）好多关键词做规则，可以使用rlike  
select 
	case 
	when mch_nm like '%按摩保健休闲%' then '按摩保健休闲'
when upper(mch_nm) rlike '.*(按摩|保健|休闲|养生|SPA|会所).*' then'按摩、保健、休闲、养生、SPA、会所'
end as reg_rules,
count(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%' 
	or upper(mch_nm)rlike '.*(按摩|保健|休闲|养生|SPA|会所).*'
group by reg_rules
order by mch_cnt desc;
2024-12-22 热门搜索关键词  
select key_word ,count(*) as search_count
from jx_query_rcd
group by key_word
order by search_countdesc
limit 5
2024-12-07 德州扑克起手牌- 手对  
select * 
from hand_permutations 
where left(card1,1)=left(card2,1)
order by id
2024-12-07 德州扑克起手牌- A花  
select * 
from hand_permutations
where right(card1,1)=right(card2,1) and
(card1 like 'A%' or card2 like 'A%')
order by id
2024-12-07 德州扑克起手牌-最强起手牌KK+  
select *
from hand_permutations
where concat(substr(card1,1,1),substr(card2,1,1)) in ('AA','KK','AK','KA')
2024-12-03 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(mch_nm)as 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
on a.mch_nm=b.mch_nm
order by trx_cnt desc
2024-12-03 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
2024-12-03 表连接（1）你们难道都去过？那就试试用InnerJoin  
select distinct t1.mch_nm 
from cmb_usr_trx_rcd t1
inner join
	(select *
	from cmb_usr_trx_rcd 
	where usr_id=5211314521) t2
on t1.mch_nm=t2.mch_nm
where t1.usr_id=5201314520 and year(t1.trx_time)=2024
order by mch_nm desc
2024-12-03 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 year(trx_time)=2024
order by trx_amt desc
limit 1
2024-12-03 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_nm
from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%'
2024-12-03 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
2024-12-03 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 mch_nm
order by trx_cnt desc
2024-12-03 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'
2024-12-03 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 (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
2024-12-03 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 trx_time between '2023-01-01' and '2024-06-30'
group by trx_amt
order by avg_trx_per_user desc
limit 5
2024-12-03 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) as trx_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 trx_cnt desc
limit 5
2024-12-03 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 date(trx_time) between '2024-09-01' and '2024-09-30' 
group by
    date(trx_time) 
order by
    trx_date;
2024-12-03 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
2024-12-03 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 24 or hour(trx_time) between 0 and 5 )
order by trx_time
2024-12-03 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 '01:00:00' and'05:00:00'
order by trx_time asc