排名

用户解题统计

过去一年提交了

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。

收藏

收藏日期 题目名称 解决状态
没有收藏的题目。

评论笔记

评论日期 题目名称 评论内容 站长评论
没有评论过的题目。

提交记录

提交日期 题目名称 提交代码
2026-03-12 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 mch_nm='红玫瑰按摩保健休闲'
AND usr_id='5201314520'
GROUP BY ser_typ
ORDER BY ser_typ ;
2026-03-12 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(trx_time) AS first_date
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
AND usr_id='5201314520'
GROUP BY ser_typ
ORDER BY ser_typ ;
2026-03-12 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'other' 
 END AS ser_typ ,
COUNT(1) AS trx_cnt,
MIN(trx_time) AS first_date
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
AND usr_id='5201314520'
GROUP BY ser_typ
ORDER BY ser_typ ASC;
2026-03-12 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'
 END AS ser_typ ,
COUNT(1) AS trx_cnt,
MIN(trx_time) AS first_date
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
GROUP BY ser_typ
ORDER BY ser_typ;
2026-03-12 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 trx_cnt DESC;
2026-03-12 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 usr_id='5201314520'
AND mch_nm='红玫瑰按摩保健休闲'
GROUP BY usr_id,mch_nm;
2026-03-12 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(*) AS total_trx_cnt,
COUNT(DISTINCT usr_id) AS unique_usr_cnt,
COUNT(*)/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 '20230101' AND '20240630'
GROUP BY trx_amt 
ORDER BY avg_trx_per_user DESC 
LIMIT 5 ;
2026-03-12 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(*) 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 '20240101' AND '20240731'
GROUP BY trx_amt
ORDER BY trx_cnt DESC 
LIMIT 5;
2026-03-12 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 sum_trx_amt
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
AND DATE(trx_time) BETWEEN '20240901' AND'20240930'
GROUP BY DATE(trx_time)
ORDER BY trx_date ;
2026-03-12 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 sum_trx_amt
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
AND MONTH(trx_time)='09'
GROUP BY DATE(trx_time)
ORDER BY trx_date ;
2026-03-12 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 sum_trx_amt
FROM cmb_usr_trx_rcd
WHERE mch_nm='红玫瑰按摩保健休闲'
AND MONTH(trx_time)='09'
GROUP BY DATE(trx_time)
2026-03-12 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;
2026-03-12 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
GROUP BY mch_nm
ORDER BY sum_trx_amt
2026-03-12 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 usr_id='5201314520'
AND DATE(trx_time) BETWEEN '20240901' AND '20240930'
AND ((HOUR(trx_time)>=22)
 OR HOUR(trx_time)<=5 )
ORDER BY trx_amt;
2026-03-12 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 usr_id='5201314520'
AND DATE(trx_time) BETWEEN '20240901' AND '20240930'
AND HOUR(trx_time) BETWEEN '01' AND '05'
ORDER BY trx_amt;
2026-03-12 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 usr_id='5201314520'
AND DATE(trx_time) BETWEEN '20240901' AND '20240930'
ORDER BY trx_amt;
2026-03-12 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 usr_id='5201314520'
AND DATE(trx_time) BETWEEN '20240901' AND '20240930'
AND ((HOUR(trx_time) >= 22) OR (HOUR(trx_time) <= 5))
order by trx_amt
2026-03-06 文科潜力股  
SELECT 
*
FROM scores
WHERE DATE(exam_date)='20240630'
AND subject='历史' OR subject='政治' OR subject='地理'
AND score>=90
ORDER BY score desc ,student_id,subject
2026-03-06 给英语成绩中上水平的学生拔尖  
SELECT 
* 
FROM scores
WHERE subject='英语'
AND DATE(exam_date)='20240630'
AND score BETWEEN 100 AND 110
ORDER BY student_id ASC;
2026-03-06 找出三个班级的女生  
select 
*
FROM students 
WHERE class_code in('C219','C220','C221')
AND gender='f'
ORDER BY student_id ASC;