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mysql - 根据其他行值调整 MIN(date)

问题描述

桌子：

+----+--------+------------+------+---------+-----------------+
| id | userID | difference | type | context |      time       |
+----+--------+------------+------+---------+-----------------+
| 83 |    111 |         30 |      |         | 7/15/2019 15:23 |
| 84 |    111 |         10 |      |         | 7/16/2019 15:28 |
| 85 |    111 |        -10 |      | Reset   | 7/16/2020 15:28 |
| 86 |    222 |         50 |      |         | 7/8/2020 15:28  |
| 87 |    222 |        -10 |      | Reset   | 7/8/2020 15:28  |
| 88 |    333 |        -10 |      | Reset   | 5/11/2020 13:15 |
| 89 |    333 |         10 |      |         | 7/16/2019 13:16 |
| 91 |    111 |         20 |      |         | 7/17/2019 23:15 |
+----+--------+------------+------+---------+-----------------+

我正在寻找一个查询，该查询返回每个用户 ID 的“差异”（> 0）的总和，该用户 ID 的最小日期为 '16/7/2019' 并带有例外，如果此用户 ID 在上下文中具有重置必须忽略小于记录重置的最小日期的行。

所以输出应该是这样的：

+--------+-------------+
| userID | SUM(points) |
+--------+-------------+
|    111 |          30|
+--------+-------------+

我的尝试：

SELECT userID, SUM(case when difference > 0 then difference else 0 end),    
FROM test WHERE (CASE 
WHEN (Select MAX(CAST(time as DATE)) where context ='Reset') > (Select 
MIN(CAST(time as DATE))) THEN (Select MAX(CAST(time as DATE)) where 
context ='Reset') ELSE (Select MIN(CAST(time as DATE))) END) = '7/16/2019' group by userID

继承人为表创建：

CREATE TABLE `test` (
  `id` int(11) NOT NULL,
  `userID` int(11) NOT NULL,
  `difference` int(11) NOT NULL,
  `type` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `context` text COLLATE utf8_unicode_ci NOT NULL,
  `time` datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

INSERT INTO `test` (`id`, `userID`, `difference`, `type`, `context`, `time`)    VALUES
(83, 111, 30, '', '', '2019-07-15 15:23:22'),
(84, 111, 10, '', '', '2019-07-16 15:28:27'),
(85, 111, -10, '', 'Reset', '2020-07-16 15:28:27'),
(86, 222, 50, '', '', '2020-07-08 15:28:27'),
(87, 222, -10, '', 'Reset', '2020-07-08 15:28:27'),
(88, 333, -10, '', 'Reset', '2020-05-11 13:15:05'),
(89, 333, -10, '', '', '2019-07-16 13:16:35'),
(91, 111, 20, '', '', '2019-07-17 23:15:57');

标签： mysqlsql

解决方案

尝试这样的事情。对于每个用户，找到重置日期并按旧记录过滤

SELECT 
    t1.userId, SUM(points)
FROM 
    table1 t1
LEFT JOIN (
    SELECT t2.userId, max(t2.date) date
    FROM table2 t2 
    WHERE context = "Reset"
    GROUP BY t2.userId
) resetDates on resetDates.userId = t1.userId
WHERE 
    t1.date >= IFNULL(resetDates.date, "01-01-2020")
GROUP BY 
    t1.userId;

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