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提交日期 题目名称 提交代码
2026-02-06 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 usr_id = 5201314520 and year(trx_time)=2024 )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
2026-02-06 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
    trx_amt = (
        select max(trx_amt)
        from cmb_usr_trx_rcd
        where usr_id = '5201314520'
          and year(trx_time) = 2024
    )
    and usr_id = '5201314520'
    and year(trx_time) = 2024;
2026-02-05 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
2026-02-04 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 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;
2026-02-04 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'
2026-02-04 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=388then '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
2026-02-04 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
2026-02-04 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
2026-02-04 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' 
group by usr_id,mch_nm
2026-02-04 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,mch_nm,min(trx_time) as first_time
from cmb_usr_trx_rcd
where usr_id= 5201314520 and mch_nm= '红玫瑰按摩保健休闲' 
group by usr_id,mch_nm
2026-02-04 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;
2026-02-04 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)
 OR (year(trx_time) = 2024 AND month(trx_time) <= 6)
group by
    trx_amt
order by
    avg_trx_per_user desc
limit 5;
2026-02-04 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)
 OR (year(trx_time) = 2024 AND month(trx_time) <= 6)
group by
    trx_amt
limit 5;
2026-02-04 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)<=7
group by trx_amt
order by trx_cnt desc
limit 5;
2026-02-04 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)<=7
group by trx_amt
order by trx_cnt
2026-02-04 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 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
2026-02-04 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 date(trx_time) between '2024-09-01' and '2024-09-30'
			and ( (hour(trx_time) >=22) or (hour(trx_time)between 0 and 5))
	and usr_id= '5201314520'
 order by trx_time
2026-02-04 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 date(trx_time) between '2024-09-01' and '2024-09-30'
			and(hour(trx_time) >=22) or (hour(trx_time)between 0 and 5)
	and usr_id= '5201314520'
 order by trx_time
2026-02-04 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 date(trx_time) between '2024-09-01' and '2024-09-30'
			and(hour(trx_time) >=22) or (hour(trx_time)<=5)
	and usr_id= '5201314520'
 order by trx_time
2026-02-04 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 date(trx_time) between '2024-09-01' and '2024-09-30'
			and hour(trx_time) between '22'and '5'
	and usr_id= '5201314520'
 order by trx_time