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提交日期 题目名称 提交代码
2024-11-15 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 1 desc
2024-11-15 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
left 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
2024-11-15 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='5211314521')a
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520')b
on a.mch_nm = b.mch_nm order by 1 desc
2024-11-15 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='5211314521')a
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520')b
on a.mch_nm != b.mch_nm order by 1 desc
2024-11-15 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
left 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
2024-11-15 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
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where month(trx_time)=2024 and usr_id='5201314520')b
on a.mch_nm != b.mch_nm order by 1 desc
2024-11-15 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
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where month(trx_time)=2024 or usr_id='5201314520')b
on a.mch_nm != b.mch_nm order by 1 desc
2024-11-15 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
left join
(select distinct mch_nm
from cmb_usr_trx_rcd
where month(trx_time)=2024 or usr_id='5201314520')b
on a.mch_nm = b.mch_nm order by 1 desc
2024-11-15 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
2024-11-15 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%'
2024-11-15 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) from cmb_usr_trx_rcd 
where mch_nm like '%按摩保健休闲'
2024-11-13 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
2024-11-13 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 4 desc
2024-11-13 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, min(trx_time), count(mch_nm), sum(trx_amt) from cmb_usr_trx_rcd 
where trx_amt>=288
and usr_id='5201314520'
group by mch_nm
2024-11-13 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'
group by
    usr_id, mch_nm;
2024-11-13 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select
    usr_id,
    mch_nm,trx_time
from
    cmb_usr_trx_rcd
where
    mch_nm = '红玫瑰按摩保健休闲'
    and usr_id = '5201314520'
order by date(trx_time) limit 1
2024-11-13 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 '2023-1-1' and '2024-6-30'
group by
    trx_amt 
order by
    avg_trx_per_user desc 
limit 5;
2024-11-13 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) in (1, 2, 3, 4, 5, 6, 7) 
group by
    trx_amt 
order by
    trx_cnt desc 
limit 5;
2024-11-13 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) in (1, 2, 3, 5, 6, 7) 
group by
    trx_amt 
order by
    trx_cnt desc 
limit 5;
2024-11-13 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) in (1, 2, 3, 5, 6, 7)
group by trx_amt
order by trx_cnt desc
limit 5