我面临的问题非常缓慢。
我正在分享表结构和结果。
如果您有任何建议,请尽快更新。
================================================== ===============表结构 - https://www.phpmyadmin.net/ - - 主机:localhost:3306 - 生成时间:2019年3月25日上午11:48 - 服务器版本:5.5。 61-cll - PHP版本:7.2.7
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";
--
-- Database: `energe3c_lms`
--
-- --------------------------------------------------------
--
-- Table structure for table `user_material`
--
CREATE TABLE `user_material` (
`id` int(11) NOT NULL,
`user_course_id` int(11) NOT NULL,
`user_id` int(11) NOT NULL,
`material_id` int(11) NOT NULL,
`attempt` int(11) NOT NULL,
`another_attempt` tinyint(1) DEFAULT '0',
`status` varchar(255) DEFAULT NULL,
`complete` tinyint(1) DEFAULT NULL,
`percent` float DEFAULT '0',
`time` varchar(255) DEFAULT NULL,
`marking_time` varchar(255) DEFAULT NULL,
`marked_by` int(11) DEFAULT NULL,
`feedback` text,
`submitted_date` datetime DEFAULT NULL,
`marking_date` datetime DEFAULT NULL,
`created` datetime DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Indexes for dumped tables
--
--
-- Indexes for table `user_material`
--
ALTER TABLE `user_material`
ADD PRIMARY KEY (`id`),
ADD KEY `user_material-user` (`user_id`),
ADD KEY `user_material-material` (`material_id`),
ADD KEY `user_material-marking-user` (`marked_by`),
ADD KEY `user_course-user_material` (`user_course_id`);
--
-- AUTO_INCREMENT for dumped tables
--
--
-- AUTO_INCREMENT for table `user_material`
--
ALTER TABLE `user_material`
MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
--
-- Constraints for dumped tables
--
--
-- Constraints for table `user_material`
--
ALTER TABLE `user_material`
ADD CONSTRAINT `user_course-user_material` FOREIGN KEY (`user_course_id`) REFERENCES `user_course` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
ADD CONSTRAINT `user_material-marking-user` FOREIGN KEY (`marked_by`) REFERENCES `user` (`id`) ON DELETE SET NULL ON UPDATE CASCADE,
ADD CONSTRAINT `user_material-material` FOREIGN KEY (`material_id`) REFERENCES `material` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
ADD CONSTRAINT `user_material-user` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
显示行0 - 24(总计25586268,查询耗时0.0007秒。)
SELECT * FROM
user_material
=================================================================
显示0到24行(共77行,查询占用22.9434秒。)
SELECT * FROM
user_material
where status ='submitted'
=================================================================
显示行0 - 24(总计34026300,查询占用24.4978秒。)[submitted_date:... - ...]
SELECT * FROM
user_material
ORDER BY submitted_date ASC
=================================================================
如果您有任何建议,请更新我。
我在yii2框架中使用此查询