排名

用户解题统计

过去一年提交了

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。

收藏

收藏日期 题目名称 解决状态
没有收藏的题目。

评论笔记

评论日期 题目名称 评论内容 站长评论
没有评论过的题目。

提交记录

提交日期 题目名称 提交代码
2026-01-27 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
2026-01-27 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(trx_time) 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
2026-01-27 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(trx_amt) 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
2026-01-26 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'
else ' '
    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 lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*'
group by reg_rules
order by mch_cnt desc;
2026-01-26 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
group by reg_rules
order by mch_cnt desc;
2026-01-23 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
2026-01-23 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
2026-01-23 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(trx_amt)trx_cnt, min(trx_time)first_time from cmb_usr_trx_rcd 
group by usr_id,mch_nm
order by trx_cnt desc
limit 5
2026-01-23 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)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 
wheremch_nm = '红玫瑰按摩保健休闲' 
    and
YEAR(trx_time) IN (2023, 2024)
AND MONTH(trx_time) BETWEEN 1 AND 6
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2026-01-23 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 ) 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 '2024-07-30'
 group by trx_amt
 order by trx_cnt desc
 limit 5
2026-01-22 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 date(trx_time) between'2024-09-01'and'2024-09-30' and mch_nm = '红玫瑰按摩保健休闲'
group bydate(trx_time)
2026-01-22 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),min(trx_amt),avg(trx_amt),sum(trx_amt) from cmb_usr_trx_rcd 
where date(trx_time) between'2024-09-01'and'2024-09-30'
group bydate(trx_time)
2026-01-22 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) like '2024-09%'
havingusr_id='5201314520'
order by 
    trx_time
2026-01-22 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) sum_trx_amtfrom cmb_usr_trx_rcd 
where usr_id=5201314520 and year(trx_time) = 2024
group by mch_nm
2026-01-22 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) sum_trx_amtfrom cmb_usr_trx_rcd 
where usr_id=5201314520
group by mch_nm
2026-01-22 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 hour(trx_time) between 1 and 5
having date(trx_time) 
    between '2024-09-01' and '2024-09-30'
2026-01-22 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 date(trx_time) between '2024-09-01' and'2024-09-30'
havingusr_id =5201314520
order by trx_time
2026-01-22 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 date(trx_time) between '2024-09-01' and'2024-09-30'
havingusr_id =5201314520
2025-12-13 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) like '2024-09%'
    and usr_id='5201314520'
order by 
    trx_time
2025-12-13 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_FORMAT(trx_time, '%Y-%m')='2024-09'
    and usr_id='5201314520'
order by 
    trx_time