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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。

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提交日期 题目名称 提交代码
2024-12-03 销售金额前10的商品信息 
select goods_id, sum(order_gmv) as total_gmv, 
rank()over(order by sum(order_gmv) desc) as ranking
from order_info
where date(order_time) = '2024-09-10'
group by goods_id
order by total_gmv desc
limit 10;
2024-11-27 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(mch_nm) trx_cnt
from cmb_usr_trx_rcd
where year(trx_time) in (2023,2024) and usr_id='5201314520'
group by mch_nm
having count(mch_nm) >=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
2024-11-27 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
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(1) as 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) as t1 
left join 
 (select distinct mch_nm 
from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314521') as t2 
on t1.mch_nm = t2.mch_nm
order by trx_cnt desc
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(usr_id) as trx_cnt 
from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314520'
group by mch_nm
having trx_cnt >= 20) as t1 
left join 
 (select distinct mch_nm 
from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314521') as t2 
on t1.mch_nm = t2.mch_nm
order by trx_cnt desc
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(mch_nm) as trx_cnt 
from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314520'
group by mch_nm
having trx_cnt >= 20) as t1 
left join 
 (select distinct mch_nm 
from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314521') as t2 
on t1.mch_nm = t2.mch_nm
order by trx_cnt desc
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(mch_nm) as trx_cnt from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314520'
group by mch_nm
 having trx_cnt >= 20) as t1 left join 
 (select distinct mch_nm from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = '5201314521') as t2 on t1.mch_nm = t2.mch_nm
order by t1.trx_cnt desc
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.cnt as trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(mch_nm) as cnt from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = 5201314520
group by mch_nm
 having cnt >= 20) as t1 left join 
 (select distinct mch_nm from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = 5201314521) as t2 using(mch_nm)
order by trx_cnt desc
2024-11-27 表连接(2)渣男去过我对象没去过,那就用LeftJoin 
select t1.mch_nm as asshole_tried, t1.cnt as trx_cnt, t2. mch_nm as darling_tried
from (select mch_nm, count(mch_nm) as cnt from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = 5201314520
group by mch_nm
 having cnt >= 20) as t1 left join 
 (select distinct mch_nm from cmb_usr_trx_rcd 
where year(trx_time) in (2023,2024) 
and usr_id = 5201314520) as t2 using(mch_nm)
order by trx_cnt desc
2024-11-27 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
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
2024-11-27 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
2024-11-27 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%'
2024-11-27 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%'
2024-11-27 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(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
order by 1
2024-11-27 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_amt) as trx_cnt, min(trx_time) as first_time
from cmb_usr_trx_rcd
where trx_amt >= 288 and usr_id = 5201314520
group by usr_id, mch_nm
order by trx_cnt desc
2024-11-27 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;
2024-11-27 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, 
round(count(trx_amt)/count(distinct usr_id), 4) 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 0, 5;
2024-11-27 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, 
sum(trx_amt) as total_trx_cnt, 
count(distinct usr_id) as unique_usr_cnt, 
round(sum(trx_amt)/count(distinct usr_id), 4) 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 0, 5;
2024-11-27 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, 
sum(trx_amt) as total_trx_cnt, 
count(distinct usr_id) as unique_usr_cnt, 
round(sum(trx_amt)/count(distinct usr_id), 4) 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
limit 5
2024-11-27 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 0, 5;