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提交日期 题目名称 提交代码
2024-10-30 表连接(1)你们难道都去过?那就试试用InnerJoin 
SELECT DISTINCT t1.mch_nm AS mch_nm
FROM (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520'
	AND YEAR(trx_time) = 2024
) t1
INNER JOIN (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5211414521'
	AND YEAR(trx_time) = 2024
) t2
ON t1.mch_nm = t2.mch_nm
ORDER BY mch_nm;
2024-10-30 表连接(1)你们难道都去过?那就试试用InnerJoin 
SELECT DISTINCT t1.mch_nm AS mch_nm
FROM (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201414520'
	AND YEAR(trx_time) = 2024
) t1
INNER JOIN (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5211314521'
	AND YEAR(trx_time) = 2024
) t2
ON t1.mch_nm = t2.mch_nm
ORDER BY mch_nm;
2024-10-30 表连接(1)你们难道都去过?那就试试用InnerJoin 
SELECT DISTINCT t1.mch_nm AS mch_nm
FROM (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520'
	AND YEAR(trx_time) = 2024
) t1
INNER JOIN (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5211314521'
	AND YEAR(trx_time) = 2024
) t2
ON t1.mch_nm = t2.mch_nm
ORDER BY mch_nm;
2024-10-29 表连接(1)你们难道都去过?那就试试用InnerJoin 
SELECT DISTINCT t1.mch_nm AS mch_nm
FROM (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520'
) t1
JOIN (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5211414521'
) t2
ON t1.mch_nm = t2.mch_nm
ORDER BY mch_nm;
2024-10-29 表连接(1)你们难道都去过?那就试试用InnerJoin 
SELECT DISTINCT t1.mch_nm AS mch_nm
FROM (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520'
) t1
JOIN (
SELECT usr_id,
		 mch_nm
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314521'
) t2
ON t1.mch_nm = t2.mch_nm
ORDER BY mch_nm;
2024-10-29 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 usr_id = '5201314520'
ORDER BY trx_amt DESC
LIMIT 1;
2024-10-29 字符串与通配符(1)名称里面有特服,可以使用通配符 
SELECT '%按摩保健休闲%' AS reg_rules,
		COUNT(DISTINCT mch_nm) AS mch_cnt
FROM cmb_usr_trx_rcd
WHERE mch_nm LIKE('%按摩保健休闲%')
2024-10-29 字符串与通配符(1)名称里面有特服,可以使用通配符 
SELECT '%按摩%保健休闲%' AS reg_rules,
		COUNT(DISTINCT mch_nm) AS mch_cnt
FROM cmb_usr_trx_rcd
WHERE mch_nm LIKE('%按摩%保健休闲%')
2024-10-29 字符串与通配符(1)名称里面有特服,可以使用通配符 
SELECT '按摩%保健休闲%' AS reg_rules,
	COUNT(DISTINCT mch_nm) AS mch_cnt 
FROM cmb_usr_trx_rcd
WHERE mch_nm LIKE('%按%摩%保%健%休%闲%')
2024-10-29 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%')
2024-10-29 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%');
2024-10-29 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;
2024-10-29 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 trx_cnt DESC;
2024-10-29 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';
2024-10-29 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 '2023-01-01' AND '2024-06-30')
GROUP BY trx_amt
ORDER BY avg_trx_per_user DESC
LIMIT 5;
2024-10-29 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 (DATE(trx_time) BETWEEN '2024-01-01' AND '2024-07-31')
GROUP BY trx_amt
ORDER BY trx_cnt DESC
LIMIT 5;
2024-10-29 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 trx_time LIKE('2024-09%')
GROUP BY DATE(trx_time)
ORDER BY trx_date;
2024-10-29 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 usr_id = '5201314520'
	AND mch_nm = '红玫瑰按摩保健休闲'
	AND trx_time LIKE('2024-09%')
GROUP BY(DATE(trx_time))
ORDER BY trx_date;
2024-10-29 分组与聚合函数(1)Money全都花在哪,GroupBy来查一查 
SELECT DISTINCT mch_nm,
	 			SUM(trx_amt) AS sum_trx_amt
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520'
	AND YEAR(trx_time) = 2024
GROUP BY mch_nm
ORDER BY sum_trx_amt DESC;
2024-10-29 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 '2024-09-01' AND '2024-09-30' 
AND ((HOUR(trx_time) BETWEEN 22 AND 23) OR (HOUR(trx_time) BETWEEN 0 AND 5))
ORDER BY trx_time;