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提交日期 题目名称 提交代码
2025-12-29 WHERE子查询 + 比较运算符 
select 
	usr_id,
mch_nm,
trx_time,
trx_amt
from
	cmb_usr_trx_rcd
where 
	trx_amt > (select avg(trx_amt) from cmb_usr_trx_rcd)
2025-12-29 基础标量子查询-不带分组 
select 
	usr_id,
mch_nm,
trx_time,
trx_amt,
(select avg(trx_amt)from cmb_usr_trx_rcd) as avg_trx_amt
from cmb_usr_trx_rcd
where usr_id = '5201314520'
2025-12-29 基础标量子查询-带分组 
select usr_id, sum(trx_amt),
(select avg(trx_amt)
from cmb_usr_trx_rcd)as platform_avg_amt
from cmb_usr_trx_rcd
group by usr_id
2025-12-29 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
)
2025-12-24 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 mch_nm like '%按摩%' or mch_nm like '%保健%'
or mch_nm like '%休闲%' or mch_nm like '%养生%' 
or mch_nm like '%SPA%' or mch_nm like '%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 mch_nm REGEXP '按摩|保健|休闲|养生|spa|会所'
group by reg_rules
order by mch_cnt desc;
2025-12-24 字符串与通配符(1)名称里面有特服,可以使用通配符 
selectcount(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-24 字符串与通配符(1)名称里面有特服,可以使用通配符 
select count(mch_nm) as mch_cnt
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-24 字符串与通配符(1)名称里面有特服,可以使用通配符 
select count(mch_nm)
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2025-12-23 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(trx_amt) 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
2025-12-23 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)as trx_amt, 
count(mch_nm)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
having usr_id = '5201314520'
order by trx_cnt desc
2025-12-23 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)as trx_amt, 
count(mch_nm)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
having usr_id = '5201314520'
order by trx_cnt desc
limit 5;
2025-12-23 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)as trx_amt, 
count(mch_nm)as trx_cnt,
min(date(trx_time))as first_time
from cmb_usr_trx_rcd
where usr_id = '5201314520'
and trx_amt >= 288
group by mch_nm
having usr_id = '5201314520'
order by trx_cnt desc
limit 5;
2025-12-23 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 mch_nm = '红玫瑰按摩保健休闲'
group by usr_id
having usr_id = '5201314520';
2025-12-23 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) 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) >= '2023-01-01'
and date(trx_time) < '2024-07-01'
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2025-12-23 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) 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 date(trx_time) >= '2023-01-01'
and date(trx_time) < '2024-07-01'
group by trx_amt
order by avg_trx_per_user desc
limit 5;
2025-12-23 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 any_value(trx_amt) as 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) >= '2024-01-01'
and date(trx_time) < '2024-08-01'
group by trx_amt
order by trx_cnt desc
limit 5;
2025-12-23 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 any_value(trx_amt) as trx_amt,
count(trx_amt) as trx_cnt, mch_nm
from cmb_usr_trx_rcd
where mch_nm = '红玫瑰按摩保健休闲'
and date(trx_time) >= '2024-01-01'
and date(trx_time) < '2024-08-01'
group by trx_amt
order by trx_cnt desc
limit 5;
2025-12-22 分组与聚合函数(2)擦边营收怎么样,聚合函数可看出 
select any_value(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 trx_time >= '2024-09-01'
and trx_time < '2024-10-01'
group by mch_nm, trx_date
having mch_nm = '红玫瑰按摩保健休闲'
2025-12-22 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) as sum_trx_amt from cmb_usr_trx_rcd 
where usr_id = '5201314520'
and extract(year from trx_time)=2024
group by mch_nm;
2025-12-22 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 trx_time >= '2024-09-01'
and trx_time < '2024-10-01'
and (extract(hour from trx_time) between 0 and 5
or extract(hour from trx_time) in (22,23));