2

私のクエリは次のとおりです。

SELECT `users`.`id`, `users`.`username`, `users`.`profile_picture_url`, `users`.`credits_offered`, `users`.`country_id`, `users`.`user_level`, `users`.`credits`
FROM `users`
LEFT JOIN `history` ON `history`.`actor_id` = 100 AND `history`.`receiver_id` = `users`.`id`
LEFT JOIN `blocked` ON `blocked`.`actor_id` = 100 AND `blocked`.`receiver_id` = `users`.`id`
WHERE `history`.`receiver_id` IS NULL
AND `blocked`.`receiver_id` IS NULL
AND `users`.`instagram_active` = 1
AND `users`.`banned` = 0
AND `users`.`shown_to_others` = 1
AND `users`.`featured_user` = 0
AND `users`.`id` IN(
SELECT `user_id` FROM `interests` WHERE `interest` IN(
SELECT `interest` FROM `interests` WHERE `user_id` = 100 AND `active` = 1))
AND `users`.`id` <> 100
AND `users`.`featured_user` = 0
ORDER BY (`users`.`credits` >= `users`.`credits_offered`) DESC, `users`.`credits_offered` DESC, `users`.`credits` DESC
LIMIT 0, 25

ユーザー テーブル:

CREATE TABLE `users` (
 `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
 `instagram_id` int(11) NOT NULL,
 `username` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
 `bio` text COLLATE utf8_unicode_ci,
 `website` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
 `profile_picture_url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `full_name` varchar(200) COLLATE utf8_unicode_ci NOT NULL,
 `media_count` int(11) unsigned NOT NULL,
 `followed_by_count` int(11) unsigned NOT NULL,
 `follows_count` int(11) unsigned NOT NULL,
 `last_updated` datetime NOT NULL,
 `last_updated_instagram` datetime NOT NULL,
 `instagram_active` tinyint(1) DEFAULT NULL,
 `last_login` datetime NOT NULL,
 `inserted_on` datetime NOT NULL,
 `banned` tinyint(1) NOT NULL DEFAULT '0',
 `banned_reason` text COLLATE utf8_unicode_ci,
 `oauth_token` varchar(150) COLLATE utf8_unicode_ci NOT NULL,
 `user_level` tinyint(4) NOT NULL,
 `shown_to_others` tinyint(1) NOT NULL DEFAULT '1',
 `credits_offered` tinyint(1) unsigned NOT NULL DEFAULT '2',
 `active` tinyint(1) NOT NULL DEFAULT '1',
 `email` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
 `registered_ip` varchar(17) COLLATE utf8_unicode_ci DEFAULT NULL,
 `credits` int(11) NOT NULL,
 `email_notifications` tinyint(1) NOT NULL DEFAULT '1',
 `todays_followers` int(11) NOT NULL DEFAULT '0',
 `todays_followers_hour` int(11) NOT NULL,
 `total_followers` int(11) NOT NULL,
 `credits_yesterday` int(11) NOT NULL,
 `email_is_verified` tinyint(1) NOT NULL DEFAULT '0',
 `email_announcements` tinyint(1) NOT NULL DEFAULT '1',
 `email_credits` tinyint(1) NOT NULL DEFAULT '1',
 `verification_code` varchar(25) COLLATE utf8_unicode_ci DEFAULT NULL,
 `country_id` bigint(20) unsigned DEFAULT NULL,
 `browser_info_id` bigint(20) unsigned DEFAULT NULL,
 `featured_user` tinyint(1) NOT NULL DEFAULT '0',
 `emailed_credits` tinyint(1) NOT NULL DEFAULT '0',
 `followers_same_interests` tinyint(1) NOT NULL DEFAULT '0',
 UNIQUE KEY `id` (`id`),
 UNIQUE KEY `instagram_id` (`instagram_id`),
 KEY `country_id` (`country_id`),
 KEY `browser_info_id` (`browser_info_id`),
 KEY `username` (`username`,`instagram_active`,`banned`),
 CONSTRAINT `users_ibfk_1` FOREIGN KEY (`country_id`) REFERENCES `countries` (`id`) ON DELETE SET NULL ON UPDATE CASCADE,
 CONSTRAINT `users_ibfk_2` FOREIGN KEY (`browser_info_id`) REFERENCES `browser_info` (`id`) ON DELETE SET NULL ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=3524 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

関心表:

CREATE TABLE `interests` (
 `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
 `user_id` bigint(20) unsigned NOT NULL,
 `interest` varchar(25) COLLATE utf8_unicode_ci NOT NULL,
 `inserted_dt` datetime NOT NULL,
 `active` tinyint(1) NOT NULL DEFAULT '1',
 UNIQUE KEY `id` (`id`),
 KEY `user_id` (`user_id`),
 KEY `interest` (`interest`),
 CONSTRAINT `interests_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=11828 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

ブロックされたテーブル:

CREATE TABLE `blocked` (
 `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
 `actor_id` bigint(20) unsigned NOT NULL,
 `receiver_id` bigint(20) unsigned DEFAULT NULL,
 `blocked_reason` enum('Skipped','Blocked') COLLATE utf8_unicode_ci NOT NULL,
 `inserted_dt` datetime NOT NULL,
 `active` tinyint(1) NOT NULL DEFAULT '1',
 `browser_info_id` bigint(20) unsigned DEFAULT NULL,
 UNIQUE KEY `id` (`id`),
 KEY `actor_id` (`actor_id`,`receiver_id`),
 KEY `receiver_id` (`receiver_id`),
 KEY `browser_info_id` (`browser_info_id`),
 CONSTRAINT `blocked_ibfk_1` FOREIGN KEY (`actor_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `blocked_ibfk_2` FOREIGN KEY (`receiver_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `blocked_ibfk_3` FOREIGN KEY (`browser_info_id`) REFERENCES `browser_info` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=35800 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

履歴表:

CREATE TABLE `history` (
 `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
 `actor_id` bigint(20) unsigned NOT NULL,
 `receiver_id` bigint(20) unsigned NOT NULL,
 `credits` int(11) NOT NULL,
 `dt` datetime NOT NULL,
 `browser_info_id` bigint(20) unsigned DEFAULT NULL,
 UNIQUE KEY `id` (`id`),
 KEY `actor_id` (`actor_id`,`receiver_id`),
 KEY `browser_info_id` (`browser_info_id`),
 KEY `receiver_id` (`receiver_id`),
 CONSTRAINT `history_ibfk_1` FOREIGN KEY (`browser_info_id`) REFERENCES `browser_info` (`id`) ON DELETE SET NULL ON UPDATE CASCADE,
 CONSTRAINT `history_ibfk_5` FOREIGN KEY (`actor_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `history_ibfk_6` FOREIGN KEY (`receiver_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=148552 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

プロファイラーでクエリを実行すると、次のようになります。

Status  Time

starting    0.000009
Waiting for query cache lock    0.000003
Waiting on query cache mutex    0.000003
checking query cache for query  0.000150
checking permissions    0.000004
checking permissions    0.000001
checking permissions    0.000002
checking permissions    0.000002
checking permissions    0.000004
Opening tables  0.000113
System lock 0.000018
Waiting for query cache lock    0.000003
Waiting on query cache mutex    0.000068
init    0.000122
optimizing  0.000031
statistics  0.000171
preparing   0.000070
executing   0.000003
Sorting result  0.000096
optimizing  0.000007
statistics  0.000010
preparing   0.000146
optimizing  0.000006
statistics  0.000025
preparing   7.110198
Sending data    0.000589
end 0.000009
query end   0.000011
closing tables  0.000070
freeing items   0.000045
logging slow query  0.000003
cleaning up 0.000014

したがって、このクエリの「準備」には平均で 7.11 秒かかります。これは長すぎるので、SQL が得意であればもっと短くできると思います。誰かが私を助けることができますか？それを理解するために必要なすべてのテーブルを追加しました。しばらくこれに引っかかっていました。

説明: id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY users range id id 8 NULL 1880 where; の使用。filesort の使用 1 PRIMARY history ref actor_id,receiver_id actor_id 16 const,bradley_instapromote.users.id 1 where の使用; インデックスの使用; 存在しません 1 PRIMARY ブロックされた refactor_id、receiver_id actor_id 17 const、bradley_instapromote.users.id 1 where を使用します。index 2 の使用 DEPENDENT SUBQUERY の関心 index_subquery user_id user_id 8 func 2 where の使用 3 DEPENDENT SUBQUERY の関心 index_subquery user_id,interest interest 77 func 6 where の使用

IMG について説明します。 ここに画像の説明を入力

4

1 に答える 1

0

副選択を結合に変換する

SELECT `users`.`id`, `users`.`username`, `users`.`profile_picture_url`, `users`.`credits_offered`, `users`.`country_id`, `users`.`user_level`, `users`.`credits`
FROM `users`
INNER JOIN interests AS a ON (a.user_id = users.user_id)
INNER JOIN interests AS b ON (a.interest = b.interes AND b.user_id = 100 and b.active = 1)
LEFT JOIN `history` ON `history`.`actor_id` = 100 AND `history`.`receiver_id` = `users`.`id`
LEFT JOIN `blocked` ON `blocked`.`actor_id` = 100 AND `blocked`.`receiver_id` = `users`.`id`
WHERE `history`.`receiver_id` IS NULL
AND `blocked`.`receiver_id` IS NULL
AND `users`.`instagram_active` = 1
AND `users`.`banned` = 0
AND `users`.`shown_to_others` = 1
AND `users`.`featured_user` = 0
AND `users`.`id` <> 100
AND `users`.`featured_user` = 0
ORDER BY (`users`.`credits` >= `users`.`credits_offered`) DESC, `users`.`credits_offered` DESC, `users`.`credits` DESC
LIMIT 0, 25

またはクエリを実行して関心のあるリストを取得し、それをユーザー クエリで直接使用します。

于 2013-02-23T17:06:57.780 に答える