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提交日期 题目名称 提交代码
2024-12-04 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 as asshole_tried_cnt,b.mch_nm as darling_tried
from ( 
select distinct 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(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
2024-12-04 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 as asshole_tried_cnt,b.mch_nm as darling_tried
from ( 
select distinct mch_nm,count(1) as trx_cnt
from cmb_usr_trx_rcd
where year(trx_time) in ('202','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 ('202','2024')
and usr_id='5211314521'
)b
on a.mch_nm=b.mch_nm
order by 2 desc
2024-12-04 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) as trx_cnt
from cmb_usr_trx_rcd
where year(trx_time) in ('202','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 ('202','2024')
and usr_id='5211314521'
)b
on a.mch_nm=b.mch_nm
order by 2 desc
2024-12-04 表连接(1)你们难道都去过?那就试试用InnerJoin 
selecta.*
from(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5211314521'
and year(trx_time)='2024'
)a
inner join 
(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314520'
and year(trx_time)='2024'
)b
on a.mch_nm=b.mch_nm
order by 1 desc
2024-12-04 表连接(1)你们难道都去过?那就试试用InnerJoin 
selecta.*
from(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5211314521'
and year(trx_time)='2024'
)a
inner join 
(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314521'
and year(trx_time)='2024'
)b
on a.mch_nm=b.mch_nm
order by 1 desc
2024-12-04 表连接(1)你们难道都去过?那就试试用InnerJoin 
selecta.*
from(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314520'
and year(trx_time)='2024'
)a
inner join 
(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314521'
and year(trx_time)='2024'
)b
on a.mch_nm=b.mch_nm
order by 1 desc
2024-12-04 表连接(1)你们难道都去过?那就试试用InnerJoin 
selecta.*
from(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314520'
and year(trx_time)='2024'
)a
inner join 
(
select distinct mch_nm
from cmb_usr_trx_rcd
where
usr_id='5201314521'
and year(trx_time)='2024'
)b
on a.mch_nm!=b.mch_nm
order by 1 desc
2024-12-04 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
select usr_id,
	mch_nm,
trx_time,
trx_amt
from cmb_usr_trx_rcd
where trx_amt=(
select max(trx_amt)
from cmb_usr_trx_rcd
where
	year(trx_time)='2024' and
	usr_id='5201314520'
	)
and usr_id='5201314520'
	and year(trx_time)='2024'
2024-12-04 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%'
2024-12-04 字符串与通配符(1)名称里面有特服,可以使用通配符 
select mch_nm 
from cmb_usr_trx_rcd
where mch_nm like '%按摩保健休闲%'
2024-12-04 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 
	mch_nm
order by 4 desc
2024-12-04 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
2024-12-04 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
2024-12-04 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) trx_amt,
count(usr_id) as trx_cnt,
min(trx_time) 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
2024-12-04 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) trx_amt,
count(mch_nm) as trx_cnt,
min(trx_time) 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
2024-12-04 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),
count(mch_nm) as trx_cnt,
min(trx_time) 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
2024-12-04 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),
count(trx_amt) as trx_cnt,
min(trx_time) 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
2024-12-04 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),
count(trx_amt) as trx_cnt,
min(trx_time) first_time
from cmb_usr_trx_rcd
where usr_id='5201314520'
	and trx_amt>288
group by 
	mch_nm
order by 4 desc
2024-12-04 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),
count(trx_amt) as trx_cnt,
min(trx_time) first_time
from cmb_usr_trx_rcd
where usr_id='5201314520'
	and trx_amt>288
group by 
	mch_nm
order by first_time desc
2024-12-04 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),
count(trx_amt),
min(trx_time) first_time
from cmb_usr_trx_rcd
where usr_id='5201314520'
	and trx_amt>200
group by 
	mch_nm