Sorting users by country code - mysql

Ive got a query here, i'd like it to list the countries by the most country count. However, its giving me an error, if anyone can help it would be much appreciated!
Here is the query!
SELECT country_code,count(country_code) FROM `users`
GROUP BY country_code
ORDER BY `users`.`id`
DESC LIMIT 50;
So it'd be like
| US | 150 |
| CA | 200 |
Table Structure
CREATE TABLE IF NOT EXISTS `users` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL,
`real_name` varchar(50) NOT NULL,
`mail` varchar(50) NOT NULL DEFAULT 'defaultuser#other.org',
`rank` int(11) unsigned NOT NULL DEFAULT '1',
`motto` varchar(255) NOT NULL DEFAULT 'I love Fatal Hotel!',
`account_created` varchar(50) NOT NULL,
`last_online` int(15) NOT NULL,
`online` enum('0','1') NOT NULL DEFAULT '0',
`ip_last` varchar(120) NOT NULL,
`ip_reg` varchar(120) NOT NULL,
`home_room` int(10) unsigned NOT NULL DEFAULT '0',
`daily_respect_points` int(11) NOT NULL DEFAULT '3',
`daily_pet_respect_points` int(11) NOT NULL DEFAULT '3',
`newbie_status` int(11) NOT NULL DEFAULT '0',
`is_muted` enum('0','1') NOT NULL DEFAULT '0',
`mutant_penalty` enum('0','1','2') NOT NULL DEFAULT '0',
`mutant_penalty_expire` int(11) NOT NULL DEFAULT '0',
`block_newfriends` enum('0','1') NOT NULL DEFAULT '0',
`hide_online` enum('0','1') NOT NULL DEFAULT '0',
`hide_inroom` enum('0','1') NOT NULL DEFAULT '0',
`vip` enum('0','1') NOT NULL DEFAULT '0',
`logged` int(11) NOT NULL,
`points` int(11) NOT NULL,
`country_code` varchar(20) NOT NULL,
`profile_status` enum('0','1','2') NOT NULL DEFAULT '0',
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=FIXED AUTO_INCREMENT=467835 ;
Thanks,
Josh


Here you go:
SELECT * FROM (SELECT country_code,count(country_code) AS 'Total' FROM `users`
GROUP BY country_code
ORDER BY 'Total' DESC) t LIMIT 50;
SQL Fiddle example


This might work:
SELECT country_code,count(country_code) as total FROM `users`
GROUP BY country_code
ORDER BY total
DESC LIMIT 50;

Related

mysql 'slow queries log' return a huge number of rows examined but explain seems ok

The sql query
# Query_time: 16.536276 Lock_time: 0.000159 Rows_sent: 756 Rows_examined: 8392194
SET timestamp=1555422526;
SELECT c.id AS c__id, c.company_id AS c__company_id,
c.ordinary_price AS c__ordinary_price, c.nights AS c__nights,
c.food_type AS c__food_type, c.period AS c__period,
c.period_desc AS c__period_desc, c.extra AS c__extra,
c.coupons_bought AS c__coupons_bought, c.coupon_price AS c__coupon_price,
c.coordinates AS c__coordinates, c.best_price AS c__best_price,
c.from_price AS c__from_price, c.end_datetime AS c__end_datetime,
c.hide_clock AS c__hide_clock, c.hide_discount AS c__hide_discount,
c.booking_hotel_id AS c__booking_hotel_id, c.title AS c__title,
c.option_people AS c__option_people, c.option_room AS c__option_room,
c.option_period AS c__option_period, c.city AS c__city,
c2.id AS c2__id, c2.people AS c2__people, c2.room AS c2__room,
( SELECT c8.url AS c8__url
FROM campaign_images c8
WHERE (c8.campaign_id = c.id
AND c8.photo_type = 'list')
ORDER BY c8.ordering ASC LIMIT 1
) AS c__0
FROM campaign c
LEFT JOIN campaign_options c2 ON c.id = c2.campaign_id
AND (c2.active = 1)
LEFT JOIN city_in_campaign c3 ON c.id = c3.campaign_id
LEFT JOIN city c4 ON c3.city_id = c4.id
LEFT JOIN company c5 ON c.company_id = c5.id
LEFT JOIN campaign_in_category c6 ON c.id = c6.campaign_id
LEFT JOIN campaign_in_group c7 ON c.id = c7.campaign_id
WHERE c.id IN ('13308', '13281', '13265')
AND (c.status IN ('published')
AND c.start_datetime <= NOW()
AND c.end_datetime >= NOW()
AND c5.id = '2111'
AND c.id != '14624'
AND (c7.group_id in (1)
OR c7.group_id is NULL
)
)
ORDER BY c.coupon_expire_datetime ASC;
create table campaign
CREATE TABLE `campaign` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`company_id` int(11) DEFAULT NULL,
`source_id` int(11) DEFAULT NULL,
`secondary_source_id` int(11) DEFAULT NULL,
`source_hotel_id` int(11) DEFAULT NULL,
`booking_hotel_id` int(11) DEFAULT NULL,
`booking_board_id` int(11) DEFAULT NULL,
`booking_rate` varchar(100) DEFAULT NULL,
`ordinary_price` decimal(9,2) NOT NULL,
`best_price` tinyint(1) NOT NULL DEFAULT '0',
`from_price` tinyint(1) NOT NULL DEFAULT '0',
`status` varchar(10) DEFAULT 'draft',
`type` varchar(20) DEFAULT 'other',
`deal_status` varchar(20) DEFAULT 'in_progress',
`coupon_price` decimal(9,2) NOT NULL,
`cosmote_discount` decimal(5,2) DEFAULT NULL,
`nights` int(11) NOT NULL DEFAULT '0',
`period` varchar(255) DEFAULT NULL,
`period_desc` varchar(1000) DEFAULT NULL,
`hide_period` tinyint(1) NOT NULL DEFAULT '0',
`food_type` varchar(100) DEFAULT NULL,
`stars` varchar(100) DEFAULT NULL,
`adults` tinyint(1) DEFAULT NULL,
`childs` tinyint(1) DEFAULT NULL,
`extra` varchar(255) DEFAULT NULL,
`best_point` varchar(511) DEFAULT NULL,
`extra_night_price` decimal(9,2) NOT NULL DEFAULT '0.00',
`high_season_price` decimal(9,2) NOT NULL DEFAULT '0.00',
`high_season_desc` varchar(500) DEFAULT NULL,
`high_season_extra_night_price` decimal(9,2) NOT NULL DEFAULT '0.00',
`family_packages_desc` varchar(1000) DEFAULT NULL,
`coordinates` varchar(70) DEFAULT NULL,
`start_datetime` datetime DEFAULT NULL,
`end_datetime` datetime DEFAULT NULL,
`coupon_expire_datetime` datetime DEFAULT NULL,
`active` tinyint(4) NOT NULL DEFAULT '1',
`city` varchar(255) DEFAULT NULL,
`min_coupons` int(11) NOT NULL DEFAULT '0',
`is_global` tinyint(4) NOT NULL DEFAULT '0',
`hide_clock` tinyint(1) NOT NULL DEFAULT '0',
`hide_discount` tinyint(1) NOT NULL DEFAULT '0',
`hide_purchases` tinyint(1) NOT NULL DEFAULT '0',
`booking_enabled` tinyint(1) NOT NULL DEFAULT '0',
`booking_phone` varchar(50) DEFAULT NULL,
`refresh` tinyint(1) NOT NULL DEFAULT '0',
`installments` tinyint(1) NOT NULL DEFAULT '1',
`receipt` enum('0','1') NOT NULL DEFAULT '0',
`newsletters_sent` tinyint(4) NOT NULL DEFAULT '0',
`max_coupons` int(11) NOT NULL DEFAULT '0',
`max_coupons_per_user` int(11) DEFAULT NULL,
`coupons_bought` int(11) unsigned NOT NULL DEFAULT '0',
`fake_orders` int(11) DEFAULT '0',
`title` varchar(255) DEFAULT NULL,
`newsletter_title` varchar(500) DEFAULT NULL,
`linkwise_title` varchar(500) DEFAULT NULL,
`option_title` varchar(255) DEFAULT NULL,
`option_title_en` varchar(255) DEFAULT NULL,
`option_people` varchar(150) DEFAULT NULL,
`option_room` varchar(150) DEFAULT NULL,
`option_period` varchar(150) DEFAULT NULL,
`name` varchar(1200) DEFAULT NULL,
`description` text,
`highlights` text,
`coupon_instructions` text,
`show_in_recent_deals` tinyint(4) NOT NULL DEFAULT '1',
`youtube_video_id` varchar(100) DEFAULT NULL,
`in_side` tinyint(4) NOT NULL DEFAULT '0',
`family` tinyint(1) NOT NULL DEFAULT '0',
`send_newsletter` tinyint(4) NOT NULL DEFAULT '1',
`resend_newsletter` tinyint(4) NOT NULL DEFAULT '0',
`modified_datetime` timestamp NULL DEFAULT NULL,
`created_datetime` datetime NOT NULL,
`ordering` int(11) unsigned DEFAULT '0',
PRIMARY KEY (`id`),
KEY `company_id_idx` (`company_id`),
KEY `user_id_idx` (`user_id`),
KEY `status_indx` (`status`),
KEY `str_dt_indx` (`start_datetime`),
KEY `end_dt_indx` (`end_datetime`),
KEY `side_indx` (`in_side`),
KEY `ord_indx` (`ordering`),
KEY `global_indx` (`is_global`),
KEY `act_indx` (`active`),
KEY `coup_expr_index` (`coupon_expire_datetime`)
) ENGINE=InnoDB AUTO_INCREMENT=14788 DEFAULT CHARSET=utf8
create table campaign_options
CREATE TABLE `campaign_options` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`campaign_id` int(11) NOT NULL,
`coupons_bought` int(11) unsigned NOT NULL DEFAULT '0',
`name` varchar(255) NOT NULL,
`name_en` varchar(255) DEFAULT NULL,
`people` varchar(100) DEFAULT NULL,
`room` varchar(100) DEFAULT NULL,
`food` varchar(100) DEFAULT NULL,
`period` varchar(100) DEFAULT NULL,
`coupon_price` decimal(9,2) NOT NULL,
`extra_night_price` decimal(9,2) NOT NULL DEFAULT '0.00',
`high_season_price` decimal(9,2) DEFAULT '0.00',
`high_season_extra_night_price` decimal(9,2) NOT NULL DEFAULT '0.00',
`modified_datetime` timestamp NULL DEFAULT NULL,
`created_datetime` datetime NOT NULL,
`main` tinyint(1) NOT NULL DEFAULT '0',
`family` tinyint(1) NOT NULL DEFAULT '0',
`active` tinyint(4) NOT NULL DEFAULT '1',
PRIMARY KEY (`id`),
KEY `campaign_id_idx` (`campaign_id`),
KEY `active_indx` (`active`),
KEY `family_indx` (`family`),
KEY `main_indx` (`main`)
) ENGINE=InnoDB AUTO_INCREMENT=48990 DEFAULT CHARSET=utf8
create table city_in_campaign
CREATE TABLE `city_in_campaign` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`campaign_id` int(11) DEFAULT NULL,
`city_id` int(11) DEFAULT NULL,
`ordering` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `campaign_id_idx` (`campaign_id`),
KEY `city_id_idx` (`city_id`),
KEY `order_indx` (`ordering`)
) ENGINE=InnoDB AUTO_INCREMENT=227176 DEFAULT CHARSET=utf8
create table city
CREATE TABLE `city` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`country_id` int(11) DEFAULT NULL,
`name` varchar(100) DEFAULT NULL,
`is_active` tinyint(3) unsigned DEFAULT NULL,
`modified_datetime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
KEY `country_id_idx` (`country_id`),
KEY `is_active_indx` (`is_active`)
) ENGINE=InnoDB AUTO_INCREMENT=254 DEFAULT CHARSET=utf8
create table company
CREATE TABLE `company` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`ref_id` int(11) DEFAULT NULL,
`name` varchar(100) DEFAULT NULL,
`description` text,
`logo` varchar(255) DEFAULT NULL,
`phone_number` varchar(100) DEFAULT NULL,
`address` varchar(200) DEFAULT NULL,
`coordinates` varchar(70) DEFAULT NULL,
`email` varchar(100) DEFAULT NULL,
`website` varchar(255) DEFAULT NULL,
`skype_name` varchar(50) DEFAULT NULL,
`icq_number` varchar(255) DEFAULT NULL,
`payment_information` text,
`extra1` text,
`extra2` text,
`extra3` text,
`video` varchar(500) DEFAULT NULL,
`checked` tinyint(1) NOT NULL DEFAULT '0',
`ordering` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `checked_indx` (`checked`),
KEY `ordering_indx` (`ordering`)
) ENGINE=InnoDB AUTO_INCREMENT=2519 DEFAULT CHARSET=utf8
create table campaign_in_category
CREATE TABLE `campaign_in_category` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`campaign_id` int(11) NOT NULL,
`category_id` int(11) DEFAULT NULL,
`ordering` int(11) NOT NULL DEFAULT '0',
`created_datetime` datetime NOT NULL,
PRIMARY KEY (`id`),
KEY `campaign_id_idx` (`campaign_id`),
KEY `category_id_idx` (`category_id`),
KEY `order_indx` (`ordering`)
) ENGINE=InnoDB AUTO_INCREMENT=457080 DEFAULT CHARSET=utf8
create table campaign_in_group
CREATE TABLE `campaign_in_group` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`campaign_id` int(11) DEFAULT NULL,
`group_id` int(11) DEFAULT NULL,
`created_datetime` datetime DEFAULT NULL,
`modified_datetime` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `camp_group_indx` (`campaign_id`,`group_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1175 DEFAULT CHARSET=utf8
campaign total rows: 12,657
campaign_options total rows: 43,714
city_in_campaign total rows: 15,162
city total rows: 215
company total rows: 1,756
campaign_in_category total rows: 38,817
campaign_in_group total rows: 395
explain of the query

which ones have index
it looks you need composite index because file sorting.
usage:
CREATE INDEX index_name
ON table_name(c2,c3,c4);

You are getting above result because some time o/p of explain gives different result as response of query of prod.
For optimization of query you can't have a fix answer. it varies from case to case. As for this situation I think you need to perform performance testing of this query. You can do this by inserting some records in all referenced table and then checking it's performance using explain.

LEFT JOIN campaign_in_category c6 ON c.id = c6.campaign_id
seems to be totally useless. But the Optimizer may not realize it. Remove it and any other dead code.

SQL Query between three tables - which joins?

I’m trying to create a query in mySQL to select data from pre-existing tables on a database (Moodle to be specific). I realise that the scheme isn’t great, but this has come from the Moodle database with the ‘ratings’ plugin installed.
The current data structure looks like this:
mdl_ranking_points
CREATE TABLE `mdl_ranking_points` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`userid` bigint(10) NOT NULL,
`courseid` bigint(10) NOT NULL,
`points` decimal(10,1) NOT NULL,
`timecreated` bigint(10) NOT NULL,
`timemodified` bigint(10) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COMMENT='Points of users'
mdl_ranking_logs
CREATE TABLE `mdl_ranking_logs` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`rankingid` bigint(10) NOT NULL,
`courseid` bigint(10) NOT NULL,
`course_modules_completion` bigint(10) NOT NULL,
`points` decimal(10,1) NOT NULL,
`timecreated` bigint(10) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=23 DEFAULT CHARSET=utf8 COMMENT='Points of users'
mdl_user
CREATE TABLE `mdl_user` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`auth` varchar(20) NOT NULL DEFAULT 'manual',
`confirmed` tinyint(1) NOT NULL DEFAULT '0',
`username` varchar(100) NOT NULL DEFAULT '',
`password` varchar(255) NOT NULL DEFAULT '',
`idnumber` varchar(255) NOT NULL DEFAULT '',
`firstname` varchar(100) NOT NULL DEFAULT '',
`lastname` varchar(100) NOT NULL DEFAULT '',
`email` varchar(100) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `mdl_user_mneuse_uix` (`mnethostid`,`username`),
KEY `mdl_user_fir_ix` (`firstname`),
KEY `mdl_user_las_ix` (`lastname`),
KEY `mdl_user_idn_ix` (`idnumber`),
) ENGINE=InnoDB AUTO_INCREMENT=1045 DEFAULT CHARSET=utf8 COMMENT='One record for each person'
mdl_course
CREATE TABLE `mdl_course` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`category` bigint(10) NOT NULL DEFAULT '0',
`sortorder` bigint(10) NOT NULL DEFAULT '0',
`fullname` varchar(254) NOT NULL DEFAULT '',
`shortname` varchar(255) NOT NULL DEFAULT '',
`idnumber` varchar(100) NOT NULL DEFAULT '',
`summary` longtext,
`summaryformat` tinyint(2) NOT NULL DEFAULT '0',
`format` varchar(21) NOT NULL DEFAULT 'topics',
`showgrades` tinyint(2) NOT NULL DEFAULT '1',
`newsitems` mediumint(5) NOT NULL DEFAULT '1',
`startdate` bigint(10) NOT NULL DEFAULT '0',
`enddate` bigint(10) NOT NULL DEFAULT '0',
`marker` bigint(10) NOT NULL DEFAULT '0',
`maxbytes` bigint(10) NOT NULL DEFAULT '0',
`legacyfiles` smallint(4) NOT NULL DEFAULT '0',
`showreports` smallint(4) NOT NULL DEFAULT '0',
`visible` tinyint(1) NOT NULL DEFAULT '1',
`visibleold` tinyint(1) NOT NULL DEFAULT '1',
`groupmode` smallint(4) NOT NULL DEFAULT '0',
`groupmodeforce` smallint(4) NOT NULL DEFAULT '0',
`defaultgroupingid` bigint(10) NOT NULL DEFAULT '0',
`lang` varchar(30) NOT NULL DEFAULT '',
`theme` varchar(50) NOT NULL DEFAULT '',
`timecreated` bigint(10) NOT NULL DEFAULT '0',
`timemodified` bigint(10) NOT NULL DEFAULT '0',
`requested` tinyint(1) NOT NULL DEFAULT '0',
`enablecompletion` tinyint(1) NOT NULL DEFAULT '0',
`completionnotify` tinyint(1) NOT NULL DEFAULT '0',
`cacherev` bigint(10) NOT NULL DEFAULT '0',
`calendartype` varchar(30) NOT NULL DEFAULT '',
PRIMARY KEY (`id`),
KEY `mdl_cour_cat_ix` (`category`),
KEY `mdl_cour_idn_ix` (`idnumber`),
KEY `mdl_cour_sho_ix` (`shortname`),
KEY `mdl_cour_sor_ix` (`sortorder`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8 COMMENT='Central course table';
I need to return a query with the following data:
lastname | points | average
I've tried the following query, but this doesnt return what I need (it seems that it only counts user id's that have been awarded points.
SELECT lastname AS academy,
SUM(points) AS score,
COUNT(*) AS users,
(SUM(points)/COUNT(*)) AS norm
FROM mdl_ranking_points r
LEFT JOIN mdl_user ON r.userid = mdl_user.id
LEFT JOIN mdl_course ON r.courseid = mdl_course.id
GROUP BY lastname
ORDER BY norm DESC
Any help would be much appreciated. I may be approaching this completely the wrong way.

I've tried the following query, but this doesnt return what I need (it seems that it only counts user id's that have been awarded points.
This is because of the order in the joins. This will return all users even if they don't have rewarded some points
FROM mdl_user
LEFT OUTER JOIN mdl_ranking_points
LEFT OUTER JOIN mdl_course
Or change your query with a right outer join.

Error in MySQL database code while importing

my code :
CREATE TABLE IF NOT EXISTS `friends` (
`Id` INT(10) NOT NULL AUTO_INCREMENT,
`providerid` INT(10) NOT NULL AUTO_INCREMENT,
`requestid` INT(10) NOT NULL AUTO_INCREMENT,
`status` BINARY(1) NOT NULL,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `messages` (
`Id` INT(255) NOT NULL AUTO_INCREMENT,
`fromuid` INT(255) NOT NULL,
`touid` INT(255) NOT NULL,
`sentdt` DATETIME NOT NULL,
`read` TINYINT(1) NOT NULL DEFAULT '0',
`readdt` DATETIME DEFAULT NULL,
`messagetext` LONGTEXT CHARACTER SET utf8 NOT NULL,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `users` (
`Id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(45) NOT NULL DEFAULT '',
`password` VARCHAR(32) NOT NULL DEFAULT '',
`email` VARCHAR(45) NOT NULL DEFAULT '',
`date` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
`status` TINYINT(3) UNSIGNED NOT NULL DEFAULT '0',
`authenticationTime` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
`userKey` VARCHAR(32) NOT NULL DEFAULT '',
`IP` VARCHAR(45) NOT NULL DEFAULT '',
`port` INT(10) UNSIGNED NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`)
);
error : #1064 - You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to
use near 'CREATE TABLE IF NOT EXISTS messages (
Id int(255) NOT NULL AUTO_INCREMENT,' at line 8
so plz help me correcting the code...
Thank you

There are few errors in your script.
1) there can be only one autoincrement key and it must be defined as a key
2) spelling mistable in third query of DEFAULT in
`email` varchar(45) NOT NULL DEFAULT '',
3) DEFAULT keyword used twice in 3rd query for below field and missing NULL for NOT NULL
`authenticationTime` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
CORRECT query:-
CREATE TABLE IF NOT EXISTS `friends` (
`Id` int(10) NOT NULL AUTO_INCREMENT,
`providerid` int(10) NOT NULL ,
`requestid` int(10) NOT NULL ,
`status` binary(1) NOT NULL ,
PRIMARY KEY (`Id`));
CREATE TABLE IF NOT EXISTS `messages` (
`Id` int(255) NOT NULL AUTO_INCREMENT,
`fromuid` int(255) NOT NULL,
`touid` int(255) NOT NULL,
`sentdt` datetime NOT NULL,
`read` tinyint(1) NOT NULL DEFAULT '0',
`readdt` datetime DEFAULT NULL,
`messagetext` longtext CHARACTER SET utf8 NOT NULL ,
PRIMARY KEY (`Id`)
);
CREATE TABLE IF NOT EXISTS `users` (
`Id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(45) NOT NULL DEFAULT '',
`password` varchar(32) NOT NULL DEFAULT '',
`email` varchar(45) NOT NULL DEFAULT '',
`date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`status` tinyint(3) unsigned NOT NULL DEFAULT '0',
`authenticationTime` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`userKey` varchar(32) NOT NULL DEFAULT '',
`IP` varchar(45) NOT NULL DEFAULT '',
`port` int(10) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`)
)

Indexes in Mysql table

I have such tables:
CREATE TABLE `skadate_newsfeed_action` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`entityId` int(11) NOT NULL,
`entityType` varchar(100) NOT NULL,
`feature` varchar(100) NOT NULL,
`data` longtext NOT NULL,
`status` varchar(20) NOT NULL DEFAULT 'active',
`createTime` int(11) NOT NULL,
`updateTime` int(11) NOT NULL,
`userId` int(11) NOT NULL,
`visibility` int(11) NOT NULL,
`privacy` enum('everybody','friends_only') NOT NULL DEFAULT 'everybody',
PRIMARY KEY (`id`),
KEY `userId` (`userId`),
KEY `privacy` (`visibility`),
KEY `updateTime` (`updateTime`),
KEY `entity` (`entityType`,`entityId`)
) ENGINE=MyISAM;
CREATE TABLE `skadate_profile` (
`profile_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`email` varchar(128) NOT NULL DEFAULT '',
`username` varchar(32) NOT NULL DEFAULT '',
`password` varchar(40) NOT NULL,
`sex` bigint(20) DEFAULT NULL,
`match_sex` bigint(20) DEFAULT NULL,
`birthdate` date NOT NULL DEFAULT '0000-00-00',
`headline` varchar(128) DEFAULT '',
`general_description` text,
`match_agerange` varchar(6) DEFAULT NULL,
`custom_location` varchar(255) DEFAULT NULL,
`country_id` char(2) NOT NULL DEFAULT '',
`zip` varchar(10) DEFAULT NULL,
`state_id` varchar(5) DEFAULT NULL,
`city_id` int(11) DEFAULT '0',
`join_stamp` int(10) unsigned NOT NULL DEFAULT '0',
`activity_stamp` int(10) unsigned NOT NULL DEFAULT '0',
`membership_type_id` int(10) unsigned NOT NULL DEFAULT '18',
`affiliate_id` int(8) unsigned NOT NULL DEFAULT '0',
`email_verified` enum('undefined','yes','no') NOT NULL DEFAULT 'undefined',
`reviewed` enum('n','y') NOT NULL DEFAULT 'n',
`has_photo` enum('n','y') NOT NULL DEFAULT 'n',
`has_media` enum('n','y') NOT NULL DEFAULT 'n',
`status` enum('active','on_hold','suspended') NOT NULL DEFAULT 'active',
`featured` enum('n','y') NOT NULL DEFAULT 'n',
`register_invite_score` tinyint(3) NOT NULL DEFAULT '0',
`rate_score` tinyint(3) unsigned NOT NULL DEFAULT '0',
`rates` bigint(20) unsigned NOT NULL DEFAULT '0',
`language_id` int(10) unsigned NOT NULL DEFAULT '0',
`join_ip` int(11) unsigned NOT NULL DEFAULT '0',
`neigh_location` enum('country','state','city','zip') DEFAULT NULL,
`neigh_location_distance` int(10) unsigned NOT NULL DEFAULT '0',
`bg_color` varchar(32) DEFAULT NULL,
`bg_image` varchar(32) DEFAULT NULL,
`bg_image_url` varchar(255) DEFAULT NULL,
`bg_image_mode` tinyint(1) DEFAULT NULL,
`bg_image_status` enum('active','approval') NOT NULL DEFAULT 'active',
`has_music` enum('n','y') NOT NULL DEFAULT 'n',
`is_private` tinyint(1) NOT NULL DEFAULT '0',
`subscription_id_offerit` text,
PRIMARY KEY (`profile_id`),
UNIQUE KEY `email` (`email`),
UNIQUE KEY `username` (`username`),
KEY `membership_id` (`membership_type_id`),
KEY `zip` (`zip`),
KEY `country_id` (`country_id`),
KEY `state_id` (`state_id`),
KEY `city_id` (`city_id`),
KEY `sex` (`sex`),
KEY `match_sex` (`match_sex`),
KEY `activity_stamp` (`activity_stamp`),
KEY `join_stamp` (`join_stamp`),
KEY `birthdate` (`birthdate`),
KEY `featured` (`featured`,`has_photo`,`activity_stamp`)
) ENGINE=MyISAM;
And try to perform this query:
SELECT DISTINCT `na`.*
FROM `skadate_newsfeed_action` AS `na`
LEFT JOIN `skadate_profile` AS `profile` ON ( `na`.`userId` = `profile`.`profile_id` )
WHERE ( profile.email_verified='yes' OR profile.email_verified='no' OR profile.email_verified='undefined' )
AND `profile`.`status`='active' AND `na`.`status`='active' AND `na`.`privacy`='everybody'
AND `na`.`visibility` & 1 AND `na`.`updateTime` < 1455885224
ORDER BY `na`.`updateTime` DESC, `na`.`id` DESC
LIMIT 0, 10
But when I see EXPLAIN:
Maybe someone can help me, how I can improve this query?

If you want records from only one table, then use exists rather than a join and select distinct. So:
SELECT na.*
FROM `skadate_newsfeed_action` na
WHERE EXISTS (SELECT 1
FROM skadate_profile p
WHERE na.userId = p.profile_id AND
p.email_verified IN ('yes', 'no', 'undefined') AND
p.status = 'active'
) AND
na.status = 'active' AND
na.privacy = 'everybody' AND
na.visibility & 1 > 0 AND
na.updateTime < 1455885224
ORDER BY na.`updateTime` DESC, na.`id` DESC
LIMIT 0, 10;
For this query, you want an index on skadate_profile(profile_id, status, verified). Also, the following index is probably helpful: skadate_newsfeed_action(status, privacy, updateTime, visibility, userId).

This is probably because of the DISTICT keyword. To remove duplicates MySQL needs to sort the result by every selected column.

My query is not using my indexes, how do i use explain plan and fix this slow query with MySQL

I have this query that is running slow (16 seconds), it only has 44085 records in the biggest table. Any suggestions or anything that sticks out?
thanks for any help
SELECT u.`vid`, u.`userID`, u.`localConID`, u.`lastran`, u.`laststatus`,
u.`lastmessage`, u.`active`
,u.`autorundaily`, u.`autorunmonthly`, u.`fileslocation`
,c.`conid`, c.`fname`, c.`lname`, c.`homephone`, c.`cellphone` , c.`email` ,
DATE_FORMAT(u.`lastran`,'%d/%m/%y %k:%i') lastranFormatted, u.`retrys`
FROM virtual_alerts_users u
LEFT JOIN virtual_alerts_cons c ON c.referid = u.localConID
WHERE u.userID = 9581
When i do an explain i get::
id | select_type | table | type | possible_keys | key | key_len | ref | rows | extra
1 | SIMPLE | u | ALL | Index 3 | null | null | null | 459 | Using where
1 | SIMPLE | c | ALL | null | null | null | null | 44085 |
The tables look like::
CREATE TABLE `virtual_alerts_users` (
`vid` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
`userID` INT(11) NOT NULL DEFAULT '0',
`localConID` VARCHAR(10) NULL DEFAULT NULL,
`encrpytPW` VARCHAR(100) NULL DEFAULT NULL,
`lastran` TIMESTAMP NULL DEFAULT NULL,
`laststatus` INT(11) NULL DEFAULT NULL,
`lastmessage` TEXT NULL,
`active` TINYINT(4) NOT NULL DEFAULT '0',
`autorundaily` TINYINT(4) NOT NULL DEFAULT '0',
`autorunmonthly` TINYINT(4) NOT NULL DEFAULT '0',
`fileslocation` VARCHAR(512) NULL DEFAULT NULL,
`retrys` TINYINT(4) NULL DEFAULT '0',
PRIMARY KEY (`vid`),
UNIQUE INDEX `Index 2` (`localConID`),
INDEX `Index 3` (`userID`)
)
-
CREATE TABLE `virtual_alerts_cons` (
`conid` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
`userID` INT(11) UNSIGNED NOT NULL DEFAULT '0',
`vid` INT(11) UNSIGNED NOT NULL DEFAULT '0',
`fname` VARCHAR(50) NULL DEFAULT NULL,
`lname` VARCHAR(50) NULL DEFAULT NULL,
`referid` VARCHAR(10) NULL DEFAULT NULL,
`level` VARCHAR(2) NULL DEFAULT NULL,
`status` VARCHAR(2) NULL DEFAULT NULL,
`lang` VARCHAR(15) NULL DEFAULT NULL,
`homephone` VARCHAR(15) NULL DEFAULT NULL,
`cellphone` VARCHAR(15) NULL DEFAULT NULL,
`address` VARCHAR(255) NULL DEFAULT NULL,
`email` VARCHAR(255) NULL DEFAULT NULL,
`birthday_mon` TINYINT(4) NULL DEFAULT '0',
`birthday_day` TINYINT(4) NULL DEFAULT '0',
`anv_mon` TINYINT(4) NULL DEFAULT '0',
`anv_day` TINYINT(4) NULL DEFAULT '0',
`anv_cnt` TINYINT(4) NULL DEFAULT '0',
`lasthash` BIGINT(20) NULL DEFAULT '0',
`lastupdated` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`conid`),
UNIQUE INDEX `Index 3` (`userID`, `referid`),
INDEX `Index 2` (`userID`),
INDEX `Index 4` (`vid`)
)

You have no index on referid in virtual_alerts_cons, but you do have a combined index on userID and referid.
To force MySQL to use that, change your join condition to:
LEFT JOIN
virtual_alerts_cons c
ON
c.referid = u.localConID
AND
c.userId = u.userID
Alternatively, you could create an additional index on referid.

The table virtual_alerts_con doesn't have the right kind of index for referid.
CREATE TABLE `virtual_alerts_cons` (
`conid` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
`userID` INT(11) UNSIGNED NOT NULL DEFAULT '0',
`vid` INT(11) UNSIGNED NOT NULL DEFAULT '0',
`fname` VARCHAR(50) NULL DEFAULT NULL,
`lname` VARCHAR(50) NULL DEFAULT NULL,
`referid` VARCHAR(10) NULL DEFAULT NULL,
`level` VARCHAR(2) NULL DEFAULT NULL,
`status` VARCHAR(2) NULL DEFAULT NULL,
`lang` VARCHAR(15) NULL DEFAULT NULL,
`homephone` VARCHAR(15) NULL DEFAULT NULL,
`cellphone` VARCHAR(15) NULL DEFAULT NULL,
`address` VARCHAR(255) NULL DEFAULT NULL,
`email` VARCHAR(255) NULL DEFAULT NULL,
`birthday_mon` TINYINT(4) NULL DEFAULT '0',
`birthday_day` TINYINT(4) NULL DEFAULT '0',
`anv_mon` TINYINT(4) NULL DEFAULT '0',
`anv_day` TINYINT(4) NULL DEFAULT '0',
`anv_cnt` TINYINT(4) NULL DEFAULT '0',
`lasthash` BIGINT(20) NULL DEFAULT '0',
`lastupdated` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`conid`),
UNIQUE INDEX `Index 3` (`userID`, `referid`),
INDEX `Index 2` (`userID`),
INDEX `Index 5` (`referid`),
INDEX `Index 4` (`vid`)
)
You can also probably change the query to something like this
SELECT u.`vid`, u.`userID`, u.`localConID`, u.`lastran`, u.`laststatus`,
u.`lastmessage`, u.`active`
,u.`autorundaily`, u.`autorunmonthly`, u.`fileslocation`
,c.`conid`, c.`fname`, c.`lname`, c.`homephone`, c.`cellphone` , c.`email` ,
DATE_FORMAT(u.`lastran`,'%d/%m/%y %k:%i') lastranFormatted, u.`retrys`
FROM virtual_alerts_users u
LEFT JOIN virtual_alerts_cons c ON c.referid = u.localConID AND c.userId = 9581
WHERE u.userID = 9581
That will probably take advantage of the Index 3 with both userId and referid.
The explain plan shows you that it is scanning all the rows of the virtual_alerts_con table because it can't use any indexes. Your "Index 3" isn't helping because its a multi-column index. There are restrictions on how you use multi-column indexes.
If you have an index with A, B, C, you can't search on just column C. You can search with just A, or A+B, or A+B+C.