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提交日期 题目名称 提交代码
2026-04-09 渣男腰子可真行,端午中秋干不停 
select * 
from cmb_usr_trx_rcd 
where
	usr_id = 5201314520
and (date(trx_time) between '2024-06-08' and '2024-06-10' 
or date(trx_time) between '2024-09-15' and '2024-09-17' )
2026-04-09 渣男腰子可真行,端午中秋干不停 
select * 
from cmb_usr_trx_rcd 
where
	usr_id = 5201314520
and (year(trx_time) between '2024-06-08' and '2024-06-10' 
or year(trx_time) between '2024-09-15' and '2024-09-17' )
2026-04-09 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 distinct mch_nm, count(1) trx_cnt
	from cmb_usr_trx_rcd
	where
		usr_id=5201314520
		and (year(trx_time) = 2023 or year(trx_time) = 2024)
 	group by mch_nm
	having count(1) >=20
)as a
left join
(
	select distinct mch_nm
	from cmb_usr_trx_rcd
	where
		usr_id=5211314521
		and (year(trx_time) = 2023 or year(trx_time) = 2024)
)as b
on
	a.mch_nm = b.mch_nm
order by 2 desc
2026-04-09 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='5211314521'
)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
	mch_nm desc
2026-04-09 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
or usr_id=5211314521
and year(trx_time) = 2024
group by
	mch_nm
2026-04-09 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
		order by
			trx_amt desc
)
order by
	trx_amt desc
limit 5;
2026-04-09 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)
order by
	trx_amt desc
limit 5;
2026-04-09 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_nm
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_nm desc
2026-04-09 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_nm 
from cmb_usr_trx_rcd 
where
	mch_nm like '%按摩保健休闲%'
2026-04-09 字符串与通配符(1)名称里面有特服,可以使用通配符 
select count(1) as mch_nm 
from cmb_usr_trx_rcd 
where
	mch_nm like '%按摩保健休闲%'
2026-04-09 分类(1)姿势太多很过分,分类要用CaseWhen 
select 
	case trx_amt
	when 288 then '1.WithHand'
when 388 then '2.WithMimi'
when 588 then '3.BlowJobbie'
when 888 then '4.Doi'
when 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
2026-04-08 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) 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
2026-04-08 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) 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
limit 5;
2026-04-08 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, trx_amt, count(1) trx_amt, min(trx_time) as first_time
from cmb_usr_trx_rcd 
where 
	usr_id=5201314520
and trx_amt > 288
group by
	mch_nm, trx_amt, trx_amt
limit 5;
2026-04-08 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'
and usr_id=5201314520
2026-04-08 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 date(trx_time) between '2023-01-01' and '2024-06-30'
group by
	trx_amt
order by
	avg_trx_per_user desc
limit 5;
2026-04-08 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 date(trx_time) between '2024-01-01' and '2024-07-31'
group by
	trx_amt
order by
	trx_cnt desc 
limit 5;
2026-04-08 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
2026-04-08 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 date(trx_time) between '2024-09-01' and '2024-09-30'
group by
	date(trx_time)
order by
	trx_date
2026-04-08 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