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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2025-01-15
达成2题里程碑2025-01-15
达成5题里程碑2025-02-10
达成10题里程碑2025-02-10

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收藏日期 题目名称 解决状态
2025-02-10 表连接（1）你们难道都去过？那就试试用InnerJoin  已解决
2025-02-10 字符串与通配符（2）好多关键词做规则，可以使用rlike  已解决

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提交日期 题目名称 提交代码
2025-02-19 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
select 
	a.mch_nmasshole_tried,
	a.cishudarling_tried,
	b.mch_nm
from 
(select
	mch_nm,
	count(1) cishu
from
	cmb_usr_trx_rcd
where
	year(trx_time) in (2023,2024)
	and usr_id ='5201314520'
group by
	mch_nm
having 
	cishu >=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 
	cishu desc
2025-02-19 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.cishu as darling_tried 
from 
(select
	mch_nm,
	count(1) cishu
from
	cmb_usr_trx_rcd
where
	year(trx_time) in (2023,2024)
	and usr_id ='5201314520'
group by
	mch_nm
having 
	cishu >=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 
	cishu desc
2025-02-19 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.cishu as darling_tried 
from 
(select
	mch_nm,
	count(1) cishu
from
	cmb_usr_trx_rcd
where
	year(trx_time) in (2023,2024)
	and usr_id ='5201314520'
group by
	mch_nm
having 
	cishu >=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 
	cishu desc
2025-02-19 表连接（1）你们难道都去过？那就试试用InnerJoin  
select b.mch_nm
from
(select distinct(mch_nm)
from cmb_usr_trx_rcd
where usr_id='5201314520' and year(trx_time)=2024 ) b
join
(select distinct(mch_nm)
from cmb_usr_trx_rcd
where usr_id='5211314521' and year(trx_time)=2024) a
on a.mch_nm = b.mch_nm
order by mch_nm desc
2025-02-19 表连接（1）你们难道都去过？那就试试用InnerJoin  
select
	mch_nm
from
	cmb_usr_trx_rcd
where 
	usr_id = '5201314520'
	and usr_id = 'usr_id=5211314521'
2025-02-10 表连接（1）你们难道都去过？那就试试用InnerJoin  
select
	mch_nm
from
	cmb_usr_trx_rcd
where
	year(trx_time) = 2024
group by
	mch_nm
having
	count(
		distinct case when usr_id in (5201314520, 5211314521) then usr_id else null end
		) = 2
order by
 	mch_nm desc
2025-02-10 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 
	usr_id = '5201314520'
	and year(trx_time) = 2024
order by
	trx_amt desc
limit 1
2025-02-10 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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*'
group by reg_rules
order by mch_cnt desc;
2025-02-10 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%'
2025-02-10 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 ser_typ,
count(1) trx_cnt,
	min(date(trx_time)) 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
	ser_typ
2025-02-10 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.WithMimid'
 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 ser_typ,
count(1) trx_cnt,
	min(date(trx_time)) 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
	ser_typ
2025-02-10 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
2025-02-10 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
2025-02-10 分类（1）姿势太多很过分，分类要用CaseWhen  
SELECT 
CASE 
WHEN trx_amt = 288THEN '1.WithHand'
WHEN trx_amt = 388 THEN '2.WithMimi'
WHEN trx_amt = 588THEN '3.BlowJobbie'
WHEN trx_amt = 888THEN '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 
ser_typ
2025-02-10 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.WithMimid'
 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 ser_typ,
count(1) trx_cnt,
	min(date(trx_time)) 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
	ser_typ
2025-02-10 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.WithMimid'
 when trx_amt = 288 then '3.BlowJobbie'
 when trx_amt = 288 then '4.Doi'
 when trx_amt = 288 then '5.DoubleFly'
		 else '6.other'
	end ser_typ,
count(1) trx_cnt,
	min(date(trx_time)) 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
	ser_typ
2025-02-10 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.WithMimid'
 when trx_amt = 288 then '3.BlowJobbie'
 when trx_amt = 288 then '4.Doi'
 when trx_amt = 288 then '5.DoubleFly'
		 else '6.other'
	end ser_typ,
count(1) trx_cnt,
	min(date(trx_time)) 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
2025-02-10 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 
	usr_id, mch_nm
order by
	trx_cnt desc
2025-02-10 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 
	usr_id, mch_nm
order by
	trx_cnt desc
limit
	5
2025-02-10 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) trx_amt,
count(1) trx_cnt,
min(trx_time) first_time
from
	cmb_usr_trx_rcd
where
	usr_id = '5201314520'
and trx_amt >= 288
group by
	usr_id,mch_nm
order by
	trx_cnt desc
limit
	5