回答編集履歴
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sample
answer
CHANGED
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@@ -1,4 +1,58 @@
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1
1
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user_idでgorup byするのにidやpointは拾えません
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2
2
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mysqlの場合エラーにならないだけで、いつも同じ値が正しく得られるわけではありません。
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3
3
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4
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-
とりあえずuser_idとdateにまたがった複合インデックスをつけるところから
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4
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とりあえずuser_idとdateにまたがった複合インデックスをつけるところから
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5
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6
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# triggerのsample
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7
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8
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```SQL
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CREATE TABLE `test_point_history` (
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10
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`id` int(11) NOT NULL,
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11
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`user_id` int(11) NOT NULL,
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12
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`point` int(11) NOT NULL,
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13
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`date` int(11) NOT NULL,
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`expire_date` int(11) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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create table `last_point_get`(
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`user_id` int primary key,
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`date` int
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);
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drop trigger if exists trg_aft_insert;
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delimiter //
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create trigger trg_aft_insert_test_point_history after insert on test_point_history
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for each row begin
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insert last_point_get(`user_id`,`date`) values
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(new.user_id,new.date) on duplicate key update `date`=values(`date`);
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end
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//
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delimiter ;
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```
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- データ投入
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```SQL
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INSERT INTO `test_point_history` (`id`, `user_id`, `point`, `date`, `expire_date`) VALUES
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(1, 1, 1320, 1519830000, NULL),
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(2, 2, 387, 1522508400, NULL),
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37
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(3, 2, 1716, 1525100400, NULL),
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(4, 1, 1717, 1527778800, NULL),
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(5, 4, 1261, 1530370800, NULL),
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(6, 1, 1304, 1533049200, NULL),
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(7, 2, 1031, 1535727600, NULL),
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(8, 3, 420, 1538319600, NULL),
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(9, 4, 168, 1535727600, NULL),
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(10, 1, 1859, 1540998000, NULL),
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(11, 1, 1637, 1543590000, NULL),
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(12, 1, 1125, 1551366000, NULL),
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(13, 3, 219, 1551366000, NULL);
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```
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- 結果
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```SQL
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SELECT * FROM last_point_get;
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```
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53
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|user_id|date|
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|:--:|:--:|
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|1|1551366000|
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|2|1535727600|
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|3|1551366000|
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58
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|4|1535727600|
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