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提交日期 题目名称 提交代码
2025-02-08 德州扑克起手牌- 手对 
select * 
from hand_permutations
where left(card1,1)=left(card2,1) and right(card1,1)!=right(card2,1)
order by id
2025-02-08 德州扑克起手牌- A花 
select * 
from hand_permutations
whereright(card1, 1) = right(card2, 1) and (card1 like 'A%' or card2 like 'A%') 
order by id
2025-02-08 德州扑克起手牌-最强起手牌KK+ 
select *
from hand_permutations
where 
    concat(card1, card2) like '%A%A%' or
    concat(card1, card2) like '%A%K%' or
    concat(card1, card2) like '%K%K%' or
    concat(card1, card2) like '%K%A%'
order by id;
2025-02-07 销售金额前10的商品信息 
select goods_id,
	 sum(order_gmv) as total_gmv
from order_info
where date(order_time)='2024-09-10'
group by goods_id
order by total_gmv desc
limit 10
2025-02-07 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
2025-02-06 表连接(1)你们难道都去过?那就试试用InnerJoin 
select a.mch_nm
from (
select distinct mch_nm 
from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5201314520') a
inner join (
select distinct mch_nm 
from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id='5211314521') b on a.mch_nm=b.mch_nm
order by 1 desc
2025-02-06 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 year(trx_time)=2024 and usr_id='5201314520') a
inner join (
select distinct mch_nm 
from cmb_usr_trx_rcd
where usr_id='5211314521') b on a.mch_nm=b.mch_nm
order by 1 desc
2025-02-06 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 year(trx_time)=2024 and usr_id='5201314520') a
inner join (
select distinct mch_nm 
from cmb_usr_trx_rcd
where usr_id='5211314521') b on a.mch_nm=b.mch_nm
2025-02-06 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) as t
from cmb_usr_trx_rcd
where year(trx_time)=2024 and usr_id=5201314520
)
2024-11-10 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) as mch_cnt
from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲%'
2024-11-05 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(trx_time) 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
2024-11-05 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select
	usr_id,
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 trx_time
limit 1
2024-11-04 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(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 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
2024-11-04 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(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 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
2024-11-04 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(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 date(trx_time) between '2023-01' and '2024-06'
group by trx_amt
order by avg_trx_per_user desc
limit 5
2024-11-04 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(trx_amt) 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) between 1 and 7
group by trx_amt
order by trx_cnt desc 
limit 5
2024-11-04 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) 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 year(trx_time)=2024
and month(trx_time)=9
group by trx_date
order by trx_date
2024-11-04 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 usr_id='5201314520'
	and year(trx_time)=2024
group by mch_nm
order by sum_trx_amt desc
2024-11-04 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 usr_id='5201314520'
	and year(trx_time)=2024
group by mch_nm
order by sum_trx_amt
2024-11-04 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
group by mch_nm
order by sum_trx_amt