[英]MySql query optimization using GROUP_CONCAT
此查詢已在慢日志中報告，這顯然需要 query_time: 00:00:20 秒來執行。 預計發送一行。 此查詢檢查的行數為 9702034。解釋查詢並未提供有關如何優化此查詢的太多線索。 ：
SELECT DISTINCT `ecu`.*, `ecuad`.`google_address`, `ecuad`.`town`, `ecuad`.`region`, `ecuad`.`zip`, `ecuad`.`country_id`, `ecuad`.`lat`, `ecuad`.`long`, `bc`.`name` AS `company_name`, GROUP_CONCAT( CONCAT(euad.assign_to_company_id,"_",euad.assigned_to)) AS `assign_company_dm_id`, GROUP_CONCAT( distinct edhp.location_id ) AS `location_id`, GROUP_CONCAT( distinct edhp.job_type ) AS `job_type`, GROUP_CONCAT( distinct edhp2.industry_id ) AS `industry_id`, GROUP_CONCAT( distinct edhp2.id ) AS `hiringpref_id)`, GROUP_CONCAT( distinct edhpskl.skill_id ) AS `skill_id`, GROUP_CONCAT( distinct edhpskl.category_id ) AS `category_id`, `ecli`.`login_date` FROM `es_company_users` AS `ecu`
LEFT JOIN `es_company_user_addresses` AS `ecuad` ON ecuad.dm_id = ecu.company_user_id and ecuad.base_company_id = ecu.base_company_id
LEFT JOIN `base_companies` AS `bc` ON bc.id = ecu.base_company_id
LEFT JOIN `es_user_assigned_dm` AS `euad` ON euad.foreign_id = ecu.company_user_id and euad.base_company_id = ecu.base_company_id
LEFT JOIN `es_dm_hiring_preference` AS `edhp` ON edhp.dm_id = ecu.company_user_id and edhp.base_company_id = ecu.base_company_id AND edhp.location_id > 0
LEFT JOIN `es_dm_hiring_preference` AS `edhp2` ON edhp2.dm_id = ecu.company_user_id and edhp2.base_company_id = ecu.base_company_id
LEFT JOIN `es_dm_hiring_skills` AS `edhpskl` ON edhpskl.hiring_preference_id = edhp2.id AND edhpskl.skill_id > 0
LEFT JOIN `es_edclient_login_info` AS `ecli` ON ecu.company_user_id = ecli.company_user_id AND ecli.base_company_id = ecu.base_company_id AND ecli.`login_date` = (SELECT MAX(t2.login_date) FROM es_edclient_login_info t2 WHERE (t2.company_user_id = 780)) WHERE (ecu.id = '636') AND (ecu.company_user_id = '780')
你能幫我提高這個查詢性能嗎？
這是這個查詢的解釋
+----+-------------+---------+-------+--------------------------------------------+-----------------+---------+----------------------+------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+---------+-------+--------------------------------------------+-----------------+---------+----------------------+------+-------------+
| 1 | PRIMARY | ecu | const | PRIMARY,company_user_id | PRIMARY | 4 | const | 1 | NULL |
| 1 | PRIMARY | ecuad | ref | dm_id | dm_id | 10 | const,const | 667 | NULL |
| 1 | PRIMARY | bc | const | PRIMARY | PRIMARY | 4 | const | 1 | NULL |
| 1 | PRIMARY | euad | ref | base_company_id | base_company_id | 10 | const,const | 2 | NULL |
| 1 | PRIMARY | edhp | ref | base_company_id | base_company_id | 10 | const,const | 60 | Using where |
| 1 | PRIMARY | edhp2 | ref | base_company_id | base_company_id | 10 | const,const | 60 | NULL |
| 1 | PRIMARY | edhpskl | ref | base_company_id | base_company_id | 5 | singledb_ed.edhp2.id | 1 | Using where |
| 1 | PRIMARY | ecli | ref | base_company_id,company_user_id,login_date | login_date | 5 | const | 1 | Using where |
| 2 | SUBQUERY | t2 | ref | company_user_id | company_user_id | 4 | const | 2 | NULL |
+----+-------------+---------+-------+--------------------------------------------+-----------------+---------+----------------------+------+-------------+
9 rows in set (0.00 sec)
這是此查詢的創建信息
CREATE TABLE `es_dm_hiring_skills` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`hiring_preference_id` int(11) DEFAULT NULL,
`category_id` int(11) DEFAULT NULL,
`skill_id` int(11) DEFAULT NULL,
`skill_matching_type` int(5) DEFAULT '1',
`created_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`is_cb_migrated` tinyint(4) DEFAULT '0',
`rs_migrated_id` int(11) DEFAULT NULL,
`is_eb_migrated` tinyint(5) NOT NULL DEFAULT '0',
`eb_reff_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `base_company_id` (`hiring_preference_id`)
) ENGINE=InnoDB AUTO_INCREMENT=460021 DEFAULT CHARSET=utf8;
CREATE TABLE `es_dm_hiring_preference` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`base_company_id` int(11) DEFAULT NULL,
`dm_id` int(11) DEFAULT NULL,
`category_id` int(11) DEFAULT NULL,
`job_role_id` int(11) DEFAULT NULL,
`skill_id` int(11) DEFAULT NULL,
`location_id` int(11) DEFAULT NULL,
`office_id` int(11) DEFAULT NULL COMMENT 'id of company_timezone_setting table',
`job_type` tinyint(1) DEFAULT NULL,
`industry_id` varchar(255) DEFAULT NULL,
`created_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`mod_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`is_updated` tinyint(1) DEFAULT '0' COMMENT '0=not updated, 1=updated, 2=updated by cron',
`is_cb_migrated` tinyint(4) DEFAULT '0',
`is_eb_migrated` tinyint(5) NOT NULL DEFAULT '0',
`merge_account_id` int(11) DEFAULT NULL,
`rs_migrated_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `base_company_id` (`base_company_id`,`dm_id`)
) ENGINE=InnoDB AUTO_INCREMENT=415866 DEFAULT CHARSET=utf8;
CREATE TABLE `es_user_assigned_dm` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`base_company_id` int(11) DEFAULT NULL,
`assign_to_company_id` int(11) NOT NULL,
`foreign_id` int(11) DEFAULT NULL,
`assigned_to` int(11) DEFAULT NULL COMMENT 'base user id, candidate is assigned to which user? ',
`assigned_type` int(2) DEFAULT '2' COMMENT '1= My Network, 2= Auto assignee',
`to_type` tinyint(1) DEFAULT '1' COMMENT '1 = Ed manager, 2= Marketing Consultant',
`assigned_by` int(11) DEFAULT NULL COMMENT 'dm assigned by which user',
`tiering_level` int(11) DEFAULT NULL,
`organisation_id` int(11) DEFAULT NULL,
`assigned_date` datetime DEFAULT NULL,
`modified_by` int(11) DEFAULT NULL,
`modified_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`is_cb_migrated` tinyint(4) DEFAULT '0',
`branch_id` int(11) DEFAULT NULL,
`merge_account_id` int(11) DEFAULT NULL,
`rs_migrated_id` int(11) DEFAULT NULL,
`is_eb_migrated` tinyint(4) DEFAULT '0',
`eb_reff_id` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `base_company_id` (`base_company_id`,`foreign_id`)
) ENGINE=InnoDB AUTO_INCREMENT=493547 DEFAULT CHARSET=utf8;
CREATE TABLE `base_companies` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`industry_id` int(11) DEFAULT NULL,
`country_id` int(11) DEFAULT NULL,
`supercrm_account_id` int(11) DEFAULT NULL,
`name` varchar(250) NOT NULL,
`status` tinyint(1) NOT NULL,
`size` tinyint(1) NOT NULL,
`timezone` varchar(255) DEFAULT NULL,
`logo` varchar(255) DEFAULT NULL,
`theme` varchar(255) NOT NULL,
`namespace` varchar(255) DEFAULT NULL,
`db_user` varchar(255) DEFAULT NULL,
`db_pass` varchar(255) DEFAULT NULL,
`db_host` varchar(255) NOT NULL,
`db_port` int(4) NOT NULL,
`db_socket` varchar(255) NOT NULL,
`cdn_url` varchar(255) DEFAULT NULL,
`cdn_ssl_url` varchar(256) NOT NULL,
`client_portal_flag` tinyint(1) DEFAULT NULL,
`client_company_id` int(11) DEFAULT NULL COMMENT 'Parent company id from which this have activated as client portal',
`mod_date` timestamp NULL DEFAULT NULL,
`created_date` datetime DEFAULT NULL,
`show_ed_manager` tinyint(1) DEFAULT '0' COMMENT 'temp column to flag Companys for Ed Manager',
`is_migrate_rpo` int(4) NOT NULL DEFAULT '0',
`is_sourcechain_account` smallint(2) DEFAULT '0' COMMENT '0=> Normal Account, 1=> Sourcechain account',
`sourcechain_from_name` varchar(255) DEFAULT NULL,
`sourcechain_email` varchar(255) DEFAULT NULL,
`is_cb_migrated` tinyint(4) DEFAULT '0',
`organisation_portal_flag` tinyint(4) DEFAULT '0' COMMENT '1 - CB, 2 - EB, 3 - TR ',
`blocked_organisation_flag` int(4) DEFAULT NULL COMMENT '1 - Blocked for new organisation, 2 - Removed Blocking for new organisation',
`rs_migrated_id` bigint(20) DEFAULT NULL,
`is_eb_migrated` tinyint(4) DEFAULT '0',
`eb_reff_id` bigint(20) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `status` (`status`),
KEY `base_companies` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=122873 DEFAULT CHARSET=utf8;
CREATE TABLE `es_company_user_addresses` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`dm_id` int(11) DEFAULT NULL,
`base_company_id` int(11) DEFAULT NULL,
`office_id` int(11) DEFAULT NULL COMMENT 'Primary key(id) of company_timezone_setting',
`google_address` varchar(255) DEFAULT NULL,
`type` int(11) DEFAULT '2',
`country_id` int(11) DEFAULT NULL,
`street1` tinytext,
`street2` tinytext,
`street3` tinytext,
`town` varchar(150) DEFAULT NULL,
`region` varchar(150) DEFAULT NULL,
`closest_city` varchar(150) DEFAULT NULL,
`zip` varchar(20) DEFAULT NULL,
`lat` float(10,6) DEFAULT NULL,
`long` float(10,6) DEFAULT NULL,
`last_mod_user_id` int(11) NOT NULL,
`mod_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`created_user_id` int(11) NOT NULL,
`created_date` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`is_cb_migrated` tinyint(4) DEFAULT '0',
`is_eb_migrated` tinyint(5) NOT NULL DEFAULT '0',
`eb_reff_id` int(11) DEFAULT NULL,
`updated_geo` tinyint(2) DEFAULT '0',
`merge_account_id` int(11) DEFAULT NULL,
`rs_migrated_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `dm_id` (`dm_id`,`base_company_id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=434884 DEFAULT CHARSET=utf8;
CREATE TABLE `es_edclient_login_info` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`base_company_id` int(11) NOT NULL,
`company_user_id` int(11) NOT NULL,
`company_name` varchar(255) NOT NULL,
`user_email` varchar(255) NOT NULL,
`remote_ip` varchar(255) NOT NULL,
`assign_to_id` int(11) DEFAULT NULL,
`aasigned_to_company_id` int(11) NOT NULL,
`assign_to_email` int(11) DEFAULT NULL,
`login_date` datetime NOT NULL,
`merge_account_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `base_company_id` (`base_company_id`),
KEY `company_user_id` (`company_user_id`),
KEY `login_date` (`login_date`)
) ENGINE=InnoDB AUTO_INCREMENT=101621 DEFAULT CHARSET=utf8;
CREATE TABLE `es_company_users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`base_company_id` int(11) DEFAULT NULL,
`base_user_id` int(11) DEFAULT NULL,
`company_user_id` int(11) DEFAULT NULL,
`es_client_candidate_link_id` int(11) DEFAULT NULL,
`branch_id` int(11) DEFAULT NULL,
`client_portal_id` int(11) DEFAULT NULL COMMENT 'client portal id if user is of client portal',
`crm_people_id` int(11) DEFAULT NULL COMMENT 'client user id-people_id',
`education_level` int(11) DEFAULT NULL,
`division_id` int(11) DEFAULT NULL,
`job_level` int(11) DEFAULT NULL,
`fname` varchar(50) DEFAULT NULL,
`lname` varchar(50) DEFAULT NULL,
`title` tinyint(4) DEFAULT NULL,
`job_title` varchar(100) DEFAULT NULL,
`sex` tinyint(1) DEFAULT NULL,
`dob` datetime DEFAULT NULL,
`country_id` int(4) DEFAULT NULL COMMENT 'no constraint should be made on this',
`picture` varchar(255) DEFAULT NULL,
`timezone` varchar(255) DEFAULT 'Europe/Berlin',
`function_id` int(11) DEFAULT NULL,
`default_module_id` int(11) DEFAULT NULL,
`status` tinyint(1) DEFAULT NULL COMMENT 'verified, activated, deactivated, approved',
`endorsed_user` int(1) DEFAULT '1',
`endorsed_dm_status` int(11) DEFAULT '0',
`is_private_dm` tinyint(1) DEFAULT '0' COMMENT '0 : Not private DM, 1 : Private DM ',
`marketplace_status` tinyint(1) NOT NULL DEFAULT '1' COMMENT '0-Deactive, 1-Active',
`flag_dm_feedback` tinyint(1) DEFAULT '0',
`rs_company_id` int(11) DEFAULT NULL,
`source_id` int(11) DEFAULT NULL COMMENT 'Base Company id',
`source_type` tinyint(1) DEFAULT NULL COMMENT 'We are adding dm from which section. 1 = Endorsed Client, 2 = Endorsed Manager, 3 = Get endorsed from RS',
`key_note` text,
`headhunt_note` text,
`created_user_id` int(11) DEFAULT NULL,
`created_date` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`approved_date` datetime DEFAULT NULL,
`last_mod_user_id` int(11) DEFAULT NULL,
`mod_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`last_contacted_date` timestamp NULL DEFAULT NULL,
`last_contacted_user_id` int(11) DEFAULT NULL,
`last_contacted_company_id` int(11) DEFAULT NULL,
`is_third_rep` tinyint(1) DEFAULT '0',
`is_cb_migrated` tinyint(4) DEFAULT '0',
`is_eb_migrated` tinyint(5) NOT NULL DEFAULT '0',
`eb_reff_id` int(11) DEFAULT NULL,
`is_third_sync` tinyint(4) DEFAULT '0',
`is_third_utm_sync` tinyint(4) DEFAULT '0',
`merge_account_id` int(11) DEFAULT NULL,
`is_linked_cron` int(1) DEFAULT '0',
`is_dm_SC_invite` tinyint(2) NOT NULL DEFAULT '0',
`indexed_error_flag_dm` tinyint(4) DEFAULT '0',
`is_digital` tinyint(4) DEFAULT NULL COMMENT '0=''No'', 1="Yes''',
`flag_missing_name` tinyint(2) DEFAULT '0',
PRIMARY KEY (`id`),
KEY `endorsed_dm_status` (`endorsed_dm_status`),
KEY `status` (`status`),
KEY `mod_date` (`mod_date`),
KEY `base_company_id` (`base_company_id`,`company_user_id`),
KEY `fname` (`fname`),
KEY `company_user_id` (`company_user_id`),
KEY `base_user_id` (`base_user_id`),
KEY `last_contacted_user_id` (`last_contacted_user_id`),
KEY `lname` (`lname`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=555262 DEFAULT CHARSET=utf8 COMMENT='this stores the user or DM of company';
在進行優化之前，您應該先檢查您的查詢。
GROUP_CONCAT函數是 SQL 中的聚合函數。 這意味着除非GROUP_CONCAT是您查詢的唯一列，否則您應該在查詢中使用GROUP BY 。
GROUP BY將查詢結果划分為較小的集合，然后將聚合函數（在本例中為GROUP_CONCAT ）應用於這些集合。
較舊的 MySQL 版本（和新版本配置ONLY_FULL_GROUP_BY -mode off）允許使用聚合函數而沒有GROUP BY -clause 導致各種錯誤結果。
要解決此問題，您應該列出所選列中使用的那些表的鍵（ GROUP BY ecu.id, ecuad.id, bc.id ）。
完成此操作后，請檢查WHERE使用的列和執行JOIN的列上是否有索引
MySQL GROUP_CONCAT在查詢的IN（）中使用GROUP_CONCAT
[英]Mysql GROUP_CONCAT using a GROUP_CONCAT in the query's IN()
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