我在优化查询时遇到了一点问题,我有 2 个表,一个记录测验的参与度(participation),另一个记录每个问题的答案(participation_rep),参与度与活动表相关联。
SELECT count(DISTINCT p.id) as number_of_participation
FROM participation_rep prep
INNER JOIN participation p
ON p.id = prep.id_participation
AND p.trash <> 1
WHERE prep.id_question IN (780,787,794,801,809)
AND prep.trash <> 1
GROUP BY pp.id_campaign
问题是当请求涉及的数据很多并且我不知道如何优化它时,这个请求执行起来非常繁重。
此查询需要 30-50 毫秒才能执行。
参与表结构:
CREATE TABLE IF NOT EXISTS `participation` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`id_campagne` int(11) NOT NULL,
`id_identifiant` int(11) DEFAULT NULL,
`firstname` varchar(255) DEFAULT NULL,
`surname` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`date_p` date NOT NULL,
`hour_p` time NOT NULL,
`comment` text,
`trash` tinyint(1) DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
表参与代表的结构:
CREATE TABLE IF NOT EXISTS `participation_rep` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`id_participation` int(11) NOT NULL,
`id_question` int(11) NOT NULL,
`id_rep` int(11) NOT NULL,
`trash` tinyint(1) DEFAULT '0',
PRIMARY KEY (`id`),
UNIQUE KEY `id_participation` (`id_participation`,`id_question`,`id_reponse`),
KEY `id_question` (`id_question`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;