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2024-10-28 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 = '5211414521') b    
on a.mch_nm = b.mch_nm 
order by 2 desc
2024-10-28 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
2024-10-28 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'
2024-10-28 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%'
2024-10-28 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%'
2024-10-28 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
2024-10-28 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;
2024-10-28 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;
2024-10-28 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' 
    or date(trx_time) between '2024-09-01' and '2024-09-30' 
group by
    date(trx_time) 
order by
    trx_date;
2024-10-28 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, 4, 5, 6, 7) 
group by
    trx_amt 
order by
    trx_cnt desc 
limit 5;
2024-10-28 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;
2024-10-28 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 '2023-09-30' 
group by
    trx_date 
order by
    trx_date
2024-10-28 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 '2023-09-30' 
group by
    date(trx_time) 
order by
    trx_date;
2024-10-28 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 
    year(trx_time) = 2024 
    and usr_id = '5201314520' 
group by 
    mch_nm 
order by 
    sum_trx_amt desc
2024-10-28 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) in (22,23,0,1,2,3,4,5)
    and usr_id = '5201314520' 
order by trx_time
2024-10-28 条件过滤(2)半夜活动有猫腻,Hour函数给给力 
select
    *
from
    cmb_usr_trx_rcd
where
    date(trx_time) 
    between '2024-09-01' and '2024-09-30' 
    and hour(trx_time) between 0 and 5 
    and usr_id = '5201314520' 
order by trx_time
2024-10-28 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
2024-10-28 条件过滤(2)半夜活动有猫腻,Hour函数给给力 
select
    *
from
    cmb_usr_trx_rcd
where
    date(trx_time) 
    between '2024-09-01' and '2024-09-30' 
and hour(trx_time) between 1 and 5 
    and usr_id = '5201314520' 
order by trx_time
2024-10-27 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select
    *
from
    cmb_usr_trx_rcd  
where
    date(trx_time)  
    between '2024-09-01' and '2024-09-30'  
    and usr_id = '5201314520'  
order by
    trx_time
2024-10-27 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select
    *
from
    cmb_usr_trx_rcd  
where
    date(trx_time)  
    between '2024-09-01' and '2024-09-31'  
    and usr_id = '5201314520'  
order by
    trx_time