Same MySQL Query Returning Different Results on Same Server

StackOverflow https://stackoverflow.com/questions/8966407

  •  18-04-2021
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Question

I am running the following query. Sometimes it returns around 100 records, as expected, other times is returns only one record with NULL for all of the values of the joined fields. Also, explain returns a different result almost everytime.

Here is the query:

EXPLAIN
SELECT
`fieldreps`.`user_id` AS `fieldreps.user_id`,
 `fieldreps`.`availability_id` AS `fieldreps.availability_id`,
 `fieldreps`.`applicant_type` AS `fieldreps.applicant_type`,
 `fieldreps`.`license_number` AS `fieldreps.license_number`,
 `fieldreps`.`license_exp` AS `fieldreps.license_exp`,
 `fieldreps`.`license_state` AS `fieldreps.license_state`,
 `fieldreps`.`car` AS `fieldreps.car`,
 `fieldreps`.`authorized_worker` AS `fieldreps.authorized_worker`,
 `fieldreps`.`restrictions` AS `fieldreps.restrictions`,
 `fieldreps`.`night` AS `fieldreps.night`,
 `fieldreps`.`day` AS `fieldreps.day`,
 `fieldreps`.`longer` AS `fieldreps.longer`,
 `fieldreps`.`commitment` AS `fieldreps.commitment`,
 `fieldreps`.`travel_metro` AS `fieldreps.travel_metro`,
 `fieldreps`.`travel_states` AS `fieldreps.travel_states`,
 `fieldreps`.`big_employee` AS `fieldreps.big_employee`,
 `fieldreps`.`employed` AS `fieldreps.employed`,
 `fieldreps`.`retail` AS `fieldreps.retail`,
 `fieldreps`.`status` AS `fieldreps.status`,
 `fieldreps`.`start` AS `fieldreps.start`,
 `fieldreps`.`sales` AS `fieldreps.sales`,
 `fieldreps`.`study` AS `fieldreps.study`,
 `fieldreps`.`relevant` AS `fieldreps.relevant`,
 `fieldreps`.`experience` AS `fieldreps.experience`,
 `fieldreps`.`claims` AS `fieldreps.claims`,
 `fieldreps`.`education` AS `fieldreps.education`,
 `fieldreps`.`degree_details` AS `fieldreps.degree_details`,
 `fieldreps`.`degree_institution` AS `fieldreps.degree_institution`,
 `fieldreps`.`other_training` AS `fieldreps.other_training`,
 `fieldreps`.`jobs` AS `fieldreps.jobs`,
 `fieldreps`.`current_training` AS `fieldreps.current_training`,
 `fieldreps`.`interested` AS `fieldreps.interested`,
 `fieldreps`.`achievements` AS `fieldreps.achievements`,
 `fieldreps`.`passions` AS `fieldreps.passions`,
 `fieldreps`.`ambitions` AS `fieldreps.ambitions`,
 `fieldreps`.`max_travel_time` AS `fieldreps.max_travel_time`,
 `fieldreps`.`creation_time` AS `fieldreps.creation_time`,
 `fieldreps`.`resume` AS `fieldreps.resume`,
 `users`.`user_id` AS `users.user_id`,
 `users`.`email` AS `users.email`,
 `users`.`name` AS `users.name`,
 `users`.`password` AS `users.password`,
 `users`.`given_name` AS `users.given_name`,
 `users`.`title` AS `users.title`,
 `users`.`nationality` AS `users.nationality`,
 `tasks`.`task_id` AS `tasks.task_id`,
 `tasks`.`recurrence_id` AS `tasks.recurrence_id`,
 `tasks`.`parent_id` AS `tasks.parent_id`,
 `tasks`.`user_id` AS `tasks.user_id`,
 `tasks`.`campaign_id` AS `tasks.campaign_id`,
 `tasks`.`location_id` AS `tasks.location_id`,
 `tasks`.`title` AS `tasks.title`,
 `tasks`.`description` AS `tasks.description`,
 `tasks`.`earliest_start` AS `tasks.earliest_start`,
 `tasks`.`deadline` AS `tasks.deadline`,
 `tasks`.`km_estimate` AS `tasks.km_estimate`,
 `tasks`.`estimate` AS `tasks.estimate`,
 `datapoints`.`datapoint_id` AS `datapoints.datapoint_id`,
 `datapoints`.`task_id` AS `datapoints.task_id`,
 `datapoints`.`datatype_id` AS `datapoints.datatype_id`,
 `datapoints`.`value` AS `datapoints.value`,
 `datapoints`.`product_id` AS `datapoints.product_id`,
 `datapoints`.`recorded` AS `datapoints.recorded`,
 `datatypes`.`datatype_id` AS `datatypes.datatype_id`,
 `datatypes`.`datatype_template_id` AS `datatypes.datatype_template_id`,
 `datatypes`.`client_id` AS `datatypes.client_id`,
 `datatypes`.`name` AS `datatypes.name`,
 `datatypes`.`description` AS `datatypes.description`,
 `datatypes`.`options` AS `datatypes.options`,
 `locations`.`location_id` AS `locations.location_id`,
 `locations`.`retailer_group_id` AS `locations.retailer_group_id`,
 `locations`.`latitude` AS `locations.latitude`,
 `locations`.`longitude` AS `locations.longitude`,
 `locations`.`name` AS `locations.name`,
 `locations`.`address` AS `locations.address`,
 `locations`.`city` AS `locations.city`,
 `locations`.`state` AS `locations.state`,
 `locations`.`postal` AS `locations.postal`,
 `locations`.`phone` AS `locations.phone`,
 `locations`.`suburb` AS `locations.suburb`,
 `locations`.`country` AS `locations.country`,
 `locations`.`region` AS `locations.region`,
 `locations`.`coverage` AS `locations.coverage`,
 `locations`.`store_number` AS `locations.store_number`,
 `locations`.`store_type` AS `locations.store_type`

 FROM `fieldreps` AS `fieldreps`

 LEFT JOIN `users` ON (`fieldreps`.`user_id` = `users`.`user_id`)
 LEFT JOIN `tasks` ON (`fieldreps`.`user_id` = `tasks`.`user_id`)
 LEFT JOIN `datapoints` ON (`tasks`.`task_id` = `datapoints`.`task_id`)
 LEFT JOIN `datatypes` ON (`datapoints`.`datatype_id` = `datatypes`.`datatype_id`)
 LEFT JOIN `locations` ON (`tasks`.`location_id` = `locations`.`location_id`)

 WHERE `fieldreps`.`user_id` LIKE '5f5dc29c-832e-5646-9dc2-46d774bfb1ec'

One Result Second Result

No worky worked

I am running the query in phpMyAdmin. Database is hosted on xeround.com(Could it be a bug in their configuration?)

I am stumped. I am not sure where to go from here.

Thanks in advance!

UPDATE:

Here is the dump from phpMyAdmin:

-- phpMyAdmin SQL Dump
-- version 3.4.3.2
-- http://www.phpmyadmin.net
--
-- Generation Time: Jan 07, 2012 at 08:20 PM
-- Server version: 5.1.42
-- PHP Version: 5.3.1

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

--
-- Database: `big_development`
--

-- --------------------------------------------------------

--
-- Table structure for table `datapoints`
--

CREATE TABLE IF NOT EXISTS `datapoints` (
  `datapoint_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `task_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `datatype_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `value` text COLLATE utf8_bin,
  `product_id` varchar(36) COLLATE utf8_bin DEFAULT NULL,
  `recorded` text COLLATE utf8_bin,
  PRIMARY KEY (`datapoint_id`),
  KEY `task_id` (`task_id`),
  KEY `datatype_id` (`datatype_id`),
  KEY `product_id` (`product_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

-- --------------------------------------------------------

--
-- Table structure for table `datatypes`
--

CREATE TABLE IF NOT EXISTS `datatypes` (
  `datatype_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `datatype_template_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `client_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `name` text COLLATE utf8_bin,
  `description` text COLLATE utf8_bin,
  `options` text COLLATE utf8_bin,
  PRIMARY KEY (`datatype_id`),
  KEY `datatype_template_id` (`datatype_template_id`),
  KEY `client_id` (`client_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

-- --------------------------------------------------------

--
-- Table structure for table `fieldreps`
--

CREATE TABLE IF NOT EXISTS `fieldreps` (
  `user_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `availability_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `applicant_type` text COLLATE utf8_bin NOT NULL,
  `license_number` text COLLATE utf8_bin NOT NULL,
  `license_exp` text COLLATE utf8_bin,
  `license_state` text COLLATE utf8_bin,
  `car` text COLLATE utf8_bin NOT NULL,
  `authorized_worker` text COLLATE utf8_bin NOT NULL,
  `restrictions` text COLLATE utf8_bin NOT NULL,
  `night` text COLLATE utf8_bin NOT NULL,
  `day` text COLLATE utf8_bin NOT NULL,
  `longer` text COLLATE utf8_bin NOT NULL,
  `commitment` text COLLATE utf8_bin NOT NULL,
  `travel_metro` text COLLATE utf8_bin NOT NULL,
  `travel_states` text COLLATE utf8_bin NOT NULL,
  `big_employee` text COLLATE utf8_bin NOT NULL,
  `employed` text COLLATE utf8_bin NOT NULL,
  `retail` text COLLATE utf8_bin NOT NULL,
  `status` text COLLATE utf8_bin NOT NULL,
  `start` text COLLATE utf8_bin,
  `sales` text COLLATE utf8_bin NOT NULL,
  `study` text COLLATE utf8_bin NOT NULL,
  `relevant` text COLLATE utf8_bin NOT NULL,
  `experience` text COLLATE utf8_bin NOT NULL,
  `claims` text COLLATE utf8_bin NOT NULL,
  `education` text COLLATE utf8_bin NOT NULL,
  `degree_details` text COLLATE utf8_bin NOT NULL,
  `degree_institution` text COLLATE utf8_bin NOT NULL,
  `other_training` text COLLATE utf8_bin NOT NULL,
  `jobs` text COLLATE utf8_bin NOT NULL,
      `current_training` text COLLATE utf8_bin NOT NULL,
  `interested` text COLLATE utf8_bin NOT NULL,
  `achievements` text COLLATE utf8_bin NOT NULL,
  `passions` text COLLATE utf8_bin NOT NULL,
  `ambitions` text COLLATE utf8_bin NOT NULL,
  `max_travel_time` text COLLATE utf8_bin NOT NULL,
  `creation_time` text COLLATE utf8_bin,
  `resume` text COLLATE utf8_bin NOT NULL,
  PRIMARY KEY (`user_id`),
  KEY `availability_id` (`availability_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

-- --------------------------------------------------------

--
-- Table structure for table `locations`
--

CREATE TABLE IF NOT EXISTS `locations` (
  `location_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `retailer_group_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `latitude` text COLLATE utf8_bin,
  `longitude` text COLLATE utf8_bin,
  `name` text COLLATE utf8_bin,
  `address` text COLLATE utf8_bin,
  `city` text COLLATE utf8_bin,
  `state` text COLLATE utf8_bin,
  `postal` text COLLATE utf8_bin,
  `phone` text COLLATE utf8_bin,
  `suburb` text COLLATE utf8_bin,
  `country` text COLLATE utf8_bin,
  `region` text COLLATE utf8_bin,
  `coverage` tinyint(1) DEFAULT NULL,
  `store_number` text COLLATE utf8_bin,
  `store_type` text COLLATE utf8_bin,
  PRIMARY KEY (`location_id`),
  KEY `retailer_group_id` (`retailer_group_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

-- --------------------------------------------------------

--
-- Table structure for table `tasks`
--

CREATE TABLE IF NOT EXISTS `tasks` (
  `task_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `recurrence_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `parent_id` varchar(36) COLLATE utf8_bin DEFAULT NULL,
  `user_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `campaign_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `location_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `title` text COLLATE utf8_bin,
  `description` text COLLATE utf8_bin,
  `earliest_start` text COLLATE utf8_bin,
  `deadline` text COLLATE utf8_bin,
  `km_estimate` text COLLATE utf8_bin,
  `estimate` int(11) DEFAULT NULL,
  PRIMARY KEY (`task_id`),
  KEY `campaign_id` (`campaign_id`),
  KEY `location_id` (`location_id`),
  KEY `user_id` (`user_id`),
  KEY `parent_id` (`parent_id`),
  KEY `recurrence_id` (`recurrence_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

-- --------------------------------------------------------

--
-- Table structure for table `users`
--

CREATE TABLE IF NOT EXISTS `users` (
  `user_id` varchar(36) COLLATE utf8_bin NOT NULL,
  `email` varchar(255) COLLATE utf8_bin NOT NULL,
  `name` text COLLATE utf8_bin,
  `password` varchar(255) COLLATE utf8_bin NOT NULL,
  `given_name` text COLLATE utf8_bin,
  `title` text COLLATE utf8_bin NOT NULL,
  `nationality` text COLLATE utf8_bin,
  PRIMARY KEY (`user_id`),
  KEY `user_id` (`user_id`)
) ENGINE=Xeround DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

EDIT:

If I remove the join on all tables but user, the query works everytime. However, as soon as I add the join on tasks, it breaks. For example, this query breaks it in the same way as the first query I posted:

SELECT
`fieldreps`.`user_id` AS `fieldreps.user_id`,
 `fieldreps`.`availability_id` AS `fieldreps.availability_id`,
 `fieldreps`.`applicant_type` AS `fieldreps.applicant_type`,
 `fieldreps`.`license_number` AS `fieldreps.license_number`,
 `fieldreps`.`license_exp` AS `fieldreps.license_exp`,
 `fieldreps`.`license_state` AS `fieldreps.license_state`,
 `fieldreps`.`car` AS `fieldreps.car`,
 `fieldreps`.`authorized_worker` AS `fieldreps.authorized_worker`,
 `fieldreps`.`restrictions` AS `fieldreps.restrictions`,
 `fieldreps`.`night` AS `fieldreps.night`,
 `fieldreps`.`day` AS `fieldreps.day`,
 `fieldreps`.`longer` AS `fieldreps.longer`,
 `fieldreps`.`commitment` AS `fieldreps.commitment`,
 `fieldreps`.`travel_metro` AS `fieldreps.travel_metro`,
 `fieldreps`.`travel_states` AS `fieldreps.travel_states`,
 `fieldreps`.`big_employee` AS `fieldreps.big_employee`,
 `fieldreps`.`employed` AS `fieldreps.employed`,
 `fieldreps`.`retail` AS `fieldreps.retail`,
 `fieldreps`.`status` AS `fieldreps.status`,
 `fieldreps`.`start` AS `fieldreps.start`,
 `fieldreps`.`sales` AS `fieldreps.sales`,
 `fieldreps`.`study` AS `fieldreps.study`,
 `fieldreps`.`relevant` AS `fieldreps.relevant`,
 `fieldreps`.`experience` AS `fieldreps.experience`,
 `fieldreps`.`claims` AS `fieldreps.claims`,
 `fieldreps`.`education` AS `fieldreps.education`,
 `fieldreps`.`degree_details` AS `fieldreps.degree_details`,
 `fieldreps`.`degree_institution` AS `fieldreps.degree_institution`,
 `fieldreps`.`other_training` AS `fieldreps.other_training`,
 `fieldreps`.`jobs` AS `fieldreps.jobs`,
 `fieldreps`.`current_training` AS `fieldreps.current_training`,
 `fieldreps`.`interested` AS `fieldreps.interested`,
 `fieldreps`.`achievements` AS `fieldreps.achievements`,
 `fieldreps`.`passions` AS `fieldreps.passions`,
 `fieldreps`.`ambitions` AS `fieldreps.ambitions`,
 `fieldreps`.`max_travel_time` AS `fieldreps.max_travel_time`,
 `fieldreps`.`creation_time` AS `fieldreps.creation_time`,
 `fieldreps`.`resume` AS `fieldreps.resume`,
 `users`.`user_id` AS `users.user_id`,
     `users`.`email` AS `users.email`,
 `users`.`name` AS `users.name`,
 `users`.`password` AS `users.password`,
 `users`.`given_name` AS `users.given_name`,
 `users`.`title` AS `users.title`,
 `users`.`nationality` AS `users.nationality`,
 `tasks`.`task_id` AS `tasks.task_id`,
 `tasks`.`recurrence_id` AS `tasks.recurrence_id`,
 `tasks`.`parent_id` AS `tasks.parent_id`,
 `tasks`.`user_id` AS `tasks.user_id`,
 `tasks`.`campaign_id` AS `tasks.campaign_id`,
 `tasks`.`location_id` AS `tasks.location_id`,
 `tasks`.`title` AS `tasks.title`,
 `tasks`.`description` AS `tasks.description`,
 `tasks`.`earliest_start` AS `tasks.earliest_start`,
 `tasks`.`deadline` AS `tasks.deadline`,
 `tasks`.`km_estimate` AS `tasks.km_estimate`,
 `tasks`.`estimate` AS `tasks.estimate`

 FROM `fieldreps` AS `fieldreps`

 LEFT JOIN `users` ON (`fieldreps`.`user_id` = `users`.`user_id`)
 LEFT JOIN `tasks` ON (`fieldreps`.`user_id` = `tasks`.`user_id`)

 WHERE `fieldreps`.`user_id` LIKE '5f5dc29c-832e-5646-9dc2-46d774bfb1ec'
Was it helpful?

Solution

The connection and database collation differed.

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