大家好我有一个MySQL查询从多个表中提取数据。这里是我的查询MySQL查询优化改进
SELECT
user_id as id,
user_name as name,
user_phone as phone,
user_email as email,
user_address1 as address1,
user_address2 as address2,
user_city as city,
user_state as state,
user_country as country,
user_available as available,
user_location as location,
user_latitude as latitude,
user_longitude as longitude,
user_description as description,
user_company as company,
user_gender as gender,
(SELECT MIN(service_price) FROM service WHERE service.user_id = a.user_id) as price,
(SELECT service_recomanded FROM service WHERE service.user_id = a.user_id ORDER BY service.service_price ASC LIMIT 1) as recomandad,
verified_email,
verified_facebook,
verified_phone,
verified_twitter,
(SELECT providerphoto_name FROM providerphoto WHERE providerphoto.user_id = a.user_id ORDER BY providerphoto_order ASC LIMIT 1) as photo,
(SELECT ROUND(AVG(review_rate),2) FROM review WHERE review.user_id = a.user_id) AS rate,
(SELECT service_ICOC FROM service WHERE service.user_id = a.user_id ORDER BY service_price ASC LIMIT 1) as type
FROM
user a
WHERE a.user_type = 'provider'
AND a.user_active=1
AND a.user_deleted=0
它从用户表,服务表,评论表和供应商图片表中获取数据。它也可以工作,但执行时间非常缓慢。我想让它成为一个单一的查询,并避免内部的五个查询可能运行得很快。任何帮助?
表结构。
--
-- Table structure for table `providerphoto`
--
CREATE TABLE IF NOT EXISTS `providerphoto` (
`providerphoto_id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`providerphoto_file` varchar(256) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
`providerphoto_name` varchar(256) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
`providerphoto_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`providerphoto_order` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`providerphoto_id`),
KEY `user_id` (`user_id`),
KEY `providerphoto` (`user_id`,`providerphoto_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=487 ;
-- --------------------------------------------------------
--
-- Table structure for table `review`
--
CREATE TABLE IF NOT EXISTS `review` (
`review_id` int(11) NOT NULL AUTO_INCREMENT,
`review_title` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_id` int(11) NOT NULL,
`review_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`review_content` text COLLATE utf8_unicode_ci NOT NULL,
`review_user_id` int(11) NOT NULL,
`review_rate` int(10) NOT NULL DEFAULT '1',
`review_tip` int(11) NOT NULL DEFAULT '0',
`service_booked` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`review_id`),
KEY `user_id` (`user_id`),
KEY `review_date` (`review_date`),
KEY `review_user_id` (`review_user_id`),
KEY `review_rate` (`review_rate`),
KEY `review_tip` (`review_tip`),
KEY `service_booked` (`service_booked`),
KEY `review` (`user_id`,`review_rate`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=97 ;
-- --------------------------------------------------------
--
-- Table structure for table `service`
--
CREATE TABLE IF NOT EXISTS `service` (
`service_id` int(11) NOT NULL AUTO_INCREMENT,
`service_name` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`user_id` int(11) DEFAULT NULL,
`service_created_by` int(11) NOT NULL DEFAULT '0',
`service_ICOC` varchar(256) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
`service_price` int(11) NOT NULL,
`service_date_added` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`service_date_expire` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`service_time` varchar(256) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
`service_rate` varchar(256) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
`service_type` int(10) NOT NULL DEFAULT '1' COMMENT '1-in call, 2-out call, 3-in&out call',
`service_recomanded` int(2) NOT NULL DEFAULT '0',
`service_genre` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`service_message` text COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`service_id`),
KEY `user_id` (`user_id`),
KEY `service_ICOC` (`service_ICOC`(255)),
KEY `service` (`user_id`,`service_price`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=854 ;
-- --------------------------------------------------------
--
-- Table structure for table `user`
--
CREATE TABLE IF NOT EXISTS `user` (
`user_id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(256) COLLATE utf8_unicode_ci DEFAULT NULL,
`user_password` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_email` varchar(256) COLLATE utf8_unicode_ci DEFAULT NULL,
`user_phone` varchar(256) COLLATE utf8_unicode_ci DEFAULT NULL,
`user_address1` text COLLATE utf8_unicode_ci,
`user_address2` text COLLATE utf8_unicode_ci NOT NULL,
`user_city` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_state` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_country` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_company` varchar(256) COLLATE utf8_unicode_ci NOT NULL,
`user_birthday` date DEFAULT NULL,
`user_register_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
`user_type` enum('provider','client') COLLATE utf8_unicode_ci DEFAULT NULL,
`user_description` text COLLATE utf8_unicode_ci NOT NULL,
`user_available` int(10) NOT NULL DEFAULT '1',
`verified_email` tinyint(1) NOT NULL DEFAULT '0',
`verified_facebook` tinyint(1) NOT NULL DEFAULT '0',
`verified_phone` tinyint(1) NOT NULL DEFAULT '0',
`verified_twitter` tinyint(1) NOT NULL DEFAULT '0',
`user_facebook_friends` int(11) NOT NULL DEFAULT '0',
`user_twitter_friends` int(11) NOT NULL DEFAULT '0',
`user_longitude` decimal(10,5) NOT NULL DEFAULT '0.00000',
`user_latitude` decimal(10,5) NOT NULL DEFAULT '0.00000',
`user_deleted` tinyint(4) NOT NULL DEFAULT '0',
`user_gender` int(11) NOT NULL DEFAULT '0',
`user_facebook_token` varchar(200) COLLATE utf8_unicode_ci NOT NULL,
`user_active` tinyint(4) NOT NULL DEFAULT '1',
`user_location` varchar(200) COLLATE utf8_unicode_ci NOT NULL,
`user_push_notification_token` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`user_timezone_diff` int(11) NOT NULL DEFAULT '0',
`balanced_uri` text COLLATE utf8_unicode_ci NOT NULL,
`user_reset_passwd_token` varchar(200) COLLATE utf8_unicode_ci NOT NULL,
`is_test_user` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`user_id`),
KEY `deleted_idx` (`user_deleted`),
KEY `email_idx` (`user_email`(255))
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=426 ;
如果您希望我们帮助优化查询,您需要向我们展示表格和索引定义**以及每个表格的行数。也许你的表格定义不好。也许索引没有正确创建。也许你没有一个你认为你做过的那个专栏的索引。没有看到表和索引定义,我们不能说。我们还需要行计数,因为这会大大影响查询优化。如果你知道如何做一个'EXPLAIN'或者得到一个执行计划,那就把结果也放在问题中。如果您没有索引,请尽快访问http://use-the-index-luke.com。 –
您是否尝试在这些表中使用'LEFT JOIN'而不是在SELECT中添加子查询?还提供表格中索引和记录数量的详细信息。 – Slowcoder
@AndyLester这个查询得到结果,所以第一件事就是确定表中有索引,第二件事是用户表中的行数是321,查看表115服务表723提供者图片表239,并且这些表中的每一个都有user_id作为与用户表关联的外键。 –