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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
2025-04-10 德州扑克起手牌- 手对  
SELECT *
FROM hand_permutations
WHERE left(card1,1)=left(card2,1)
ORDER BY id;
2025-04-10 德州扑克起手牌- A花  
SELECT *
FROM hand_permutations
WHERE right(card1,1)=right(card2,1) AND
(card1 LIKE 'A%'OR card2 LIKE 'A%')
ORDER BY id;
2025-04-10 德州扑克起手牌- A花  
SELECT *
FROM hand_permutations
WHERE right(card1,1)=right(card2,1) AND
(card1 LIKE 'A%'OR card2 LIKE '%A')
ORDER BY id;
2025-04-10 德州扑克起手牌-最强起手牌KK+  
SELECT *
FROM hand_permutations
WHERE concat(card1,card2)LIKE '%A%A%' OR
concat(card1,card2)LIKE '%K%k%' OR
concat(card1,card2)LIKE '%A%K%' OR
concat(card1,card2)LIKE '%K%A%'
ORDER BY id;
2025-04-09 销售金额前10的商品信息  
Select
goods_id,
sum(order_gmv)
FROM
order_info
WHERE
date(order_time) = '2024-09-10'
GROUP BY
goods_id
order BY
sum(order_gmv) DESC
LIMIT
10;
2025-03-24 表连接（2）渣男去过我对象没去过，那就用LeftJoin  
SELECT a.mch_nm asshole_tried,trx_cnt,b.mch_nm darling_tried
From(SELECT
mch_nm,
count(*) trx_cnt
FROM
cmb_usr_trx_rcd
WHERE
usr_id = '5201314520'
AND year(trx_time) IN (2023, 2024)
GROUP BY
mch_nm HAVING count(*)>=20)a left JOIN (
	SELECT DISTINCT mch_nm
FROM
cmb_usr_trx_rcd
WHERE
usr_id = '5211314521'
AND year(trx_time) IN (2023, 2024)
GROUP BY
mch_nm )b ON a.mch_nm=b.mch_nm ORDER BY trx_cnt desc;
2025-03-24 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 = '5201314520'
AND year(trx_time) = 2024
) a
inner JOIN (
SELECT DISTINCT
(mch_nm)
FROM
cmb_usr_trx_rcd
WHERE
usr_id = '5211314521'
AND year(trx_time) = 2024
) b ON a.mch_nm = b.mch_nm
ORDER BY
1 DESC;
2025-03-20 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;
2025-02-28 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
ser_typ;
2025-02-25 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_nmLIKE '%按摩保健休闲%';
2025-02-23 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
2025-02-20 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
2025-02-19 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(1) 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;
2025-02-19 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
2025-02-18 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(1) 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
trx_cnt DESC;
2025-02-18 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(*) 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
trx_cnt DESC;
2025-02-18 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(*) 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
trx_cnt DESC
LIMIT
5;
2025-02-18 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(*) 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
trx_cnt DESC
LIMIT
5;
2025-02-18 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(trx_amt) 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
trx_cnt DESC
LIMIT
5;
2025-02-18 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) 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;