I'm having a problem restoring data into a mysql DB from a dump. I'm running the same version of mysql, I have disabled foreign key checks, and data types are the same, but I can't understand why the check fails
Error in foreign key constraint of table staging/bookmarks:
FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `bookmarks_video_id_foreign` FOREIGN KEY (`video_id`) REFERENCES `videos` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci:
Cannot find an index in the referenced table where the
referenced columns appear as the first columns, or column types
in the table and the referenced table do not match for constraint.
table schema
-- Server version 5.6.34-log
/*!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 */;
/*!40103 SET #OLD_TIME_ZONE=##TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET #OLD_UNIQUE_CHECKS=##UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET #OLD_SQL_MODE=##SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET #OLD_SQL_NOTES=##SQL_NOTES, SQL_NOTES=0 */;
...
--
-- Table structure for table `bookmarks`
--
DROP TABLE IF EXISTS `bookmarks`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `bookmarks` (
`id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`user_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`video_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`course_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`time` int(11) NOT NULL,
`title` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`deleted_at` timestamp NULL DEFAULT NULL,
`notes` text COLLATE utf8_unicode_ci,
PRIMARY KEY (`id`),
UNIQUE KEY `bookmarks_course_id_user_id_video_id_time_unique` (`course_id`,`user_id`,`video_id`,`time`),
KEY `bookmarks_user_id_foreign` (`user_id`),
KEY `bookmarks_video_id_foreign` (`video_id`),
CONSTRAINT `bookmarks_course_id_foreign` FOREIGN KEY (`course_id`) REFERENCES `courses` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `bookmarks_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `bookmarks_video_id_foreign` FOREIGN KEY (`video_id`) REFERENCES `videos` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*!40101 SET character_set_client = #saved_cs_client */;
...
--
-- Table structure for table `users`
--
DROP TABLE IF EXISTS `users`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `users` (
`id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`username` varchar(63) COLLATE utf8_unicode_ci DEFAULT NULL,
`password` varchar(60) COLLATE utf8_unicode_ci DEFAULT NULL,
`email` varchar(63) COLLATE utf8_unicode_ci NOT NULL,
`role_id` varchar(36) COLLATE utf8_unicode_ci DEFAULT NULL,
`last_login` datetime DEFAULT NULL,
`customer_id` int(11) DEFAULT NULL,
`hours_watched` int(11) NOT NULL DEFAULT '0',
`points` int(11) NOT NULL DEFAULT '0',
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`updated_at` timestamp NULL DEFAULT NULL,
`deleted_at` timestamp NULL DEFAULT NULL,
`remember_token` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*!40101 SET character_set_client = #saved_cs_client */;
....
--
-- Table structure for table `videos`
--
DROP TABLE IF EXISTS `videos`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `videos` (
`id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`is_public` smallint(6) NOT NULL DEFAULT '0',
`is_visible` smallint(6) NOT NULL DEFAULT '0',
`points` int(11) NOT NULL DEFAULT '0',
`duration` varchar(10) COLLATE utf8_unicode_ci NOT NULL,
`provider_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`presenter_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`level_id` varchar(36) COLLATE utf8_unicode_ci NOT NULL,
`hd_url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`high_url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`mobile_url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`transcript_file` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`deleted_at` timestamp NULL DEFAULT NULL,
`order` int(11) NOT NULL DEFAULT '0',
`prefix_title` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
`jwplayer_mediaid` varchar(16) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `videos_level_id_foreign` (`level_id`),
KEY `videos_provider_id_foreign` (`provider_id`),
KEY `videos_presenter_id_foreign` (`presenter_id`),
CONSTRAINT `videos_level_id_foreign` FOREIGN KEY (`level_id`) REFERENCES `levels` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `videos_presenter_id_foreign` FOREIGN KEY (`presenter_id`) REFERENCES `presenters` (`id`) ON UPDATE CASCADE,
CONSTRAINT `videos_provider_id_foreign` FOREIGN KEY (`provider_id`) REFERENCES `providers` (`id`) ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*!40101 SET character_set_client = #saved_cs_client */;
...
/*!40014 SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=#OLD_UNIQUE_CHECKS */;
You must define the table you want to reference (users) before you can declare a foreign key to it.
In your case, you are creating the table bookmarks before the other table users exists.
The error you got has nothing to do with the foreign_key_checks being disabled vs. enabled.
Actually, I have to correct my answer. This dump file should work fine, and does work fine when I test it in my local MySQL 5.6 instance.
The way it gets around the foreign key ordering problem is this:
SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
This disables enforcement of the foreign key rules until the enforcement is restored at the end:
SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS;
All I can suggest is that something in the spaces where you have ... is restoring foreign key enforcement too soon. You need to examine your complete file and figure that out.
Related
I am quite new to MySQL, I downloaded the file and then opened it in SQL I ran it, but it didn't work and stated the following
Error Code: 1103. Incorrect table name 'campaign';/!40101 SET #saved_cs_client = ##character_set_client /;/!40101 SET character_set'
This is where I believe the problem is
DROP TABLE IF EXISTS `campaign';
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `campaign` (
`id` bigint(20) NOT NULL,
`name` text,
`sub_category_id` bigint(20) DEFAULT NULL,
`country_id` bigint(20) DEFAULT NULL,
`currency_id` bigint(20) DEFAULT NULL,
`launched` datetime DEFAULT NULL,
`deadline` datetime DEFAULT NULL,
`goal` double DEFAULT NULL,
`pledged` double DEFAULT NULL,
`backers` bigint(20) DEFAULT NULL,
`outcome` text,
PRIMARY KEY (`id`),
KEY `country_id` (`country_id`),
KEY `sub_category_id` (`sub_category_id`),
KEY `currency_id` (`currency_id`),
CONSTRAINT `campaign_ibfk_1` FOREIGN KEY (`country_id`) REFERENCES `country` (`id`),
CONSTRAINT `campaign_ibfk_2` FOREIGN KEY (`sub_category_id`) REFERENCES `sub_category` (`id`),
CONSTRAINT `campaign_ibfk_3` FOREIGN KEY (`currency_id`) REFERENCES `currency` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
Dumping data for table `campaign`
--
LOCK TABLES `campaign` WRITE;
/*!40000 ALTER TABLE `campaign` DISABLE KEYS */;
INSERT INTO `campaign` VALUES (1,'Ragdolls',23,2,2)
INSERT INTO `campaign` VALUES (8667,'Blank Screen Films Summer Project 2013')
/*!40000 ALTER TABLE `campaign` ENABLE KEYS */;
UNLOCK TABLES;
Feel free to ask any question to attain more insight.
Where you have:
DROP TABLE IF EXISTS `campaign';
this is supposed to be:
DROP TABLE IF EXISTS `campaign`;
Either you accidentally changed the backtick to a single quote, or something in your "downloaded the file and then opened it in SQL" changed it on you.
I would like to import SQL dump file, some how it's not working.
I got this error when I try to import data.
Referencing column 'originator_id' and referenced column 'name' in foreign key constraint 'fk_rails_79d8c4ccda' are incompatible.
DROP TABLE IF EXISTS `loan_fee_shares`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `loan_fee_shares` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`originator_id` varchar(255) DEFAULT NULL,
`percent` decimal(6,2) DEFAULT NULL COMMENT 'belongs to [0,1] set',
`active` tinyint(1) DEFAULT '0',
`deactivated_at` timestamp NULL DEFAULT NULL,
`created_at` datetime NOT NULL,
`updated_at` datetime NOT NULL,
PRIMARY KEY (`id`),
KEY `fk_rails_79d8c4ccda` (`originator_id`),
CONSTRAINT `fk_rails_79d8c4ccda` FOREIGN KEY (`originator_id`) REFERENCES `originators` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
DROP TABLE IF EXISTS `originators`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `originators` (
`name` varchar(255) DEFAULT NULL,
`description` varchar(100) DEFAULT NULL,
`created_at` datetime NOT NULL,
`updated_at` datetime NOT NULL,
PRIMARY KEY (`name`),
UNIQUE KEY `index_originators_on_name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
I am posting this for someone who might have the same issue in the future.
Barmar has a good point. and I moved originators table to before loan_fee_shares. But I still had an issue.
and It had an issue with DEFAULT CHARSET=latin1, I had to change it to DEFAULT CHARSET=utf8. and It works.
I suggest that change all your tables to the same character set.
How to change all the tables in my database to UTF8 character set?
I have two database old.sql & new.sql.
I have user table named user in new.sql. and users in old.sql.
table structure for user from new.sql
--
-- Table structure for table `user`
--
DROP TABLE IF EXISTS `user`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `user` (
`id` int NOT NULL AUTO_INCREMENT,
`email` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`password` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`firstName` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`lastName` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`phoneNumber` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`role` enum('USER','ADMIN') COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'USER',
`createdOn` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
PRIMARY KEY (`id`),
UNIQUE KEY `User_email_key` (`email`),
UNIQUE KEY `User_phoneNumber_key` (`phoneNumber`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
/*!40101 SET character_set_client = #saved_cs_client */;
and users from old.sql
DROP TABLE IF EXISTS `users`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `users` (
`id` int NOT NULL AUTO_INCREMENT,
`roleId` int NOT NULL,
`firstName` varchar(255) DEFAULT NULL,
`lastName` varchar(255) DEFAULT NULL,
`email` varchar(255) NOT NULL,
`password` varchar(255) DEFAULT NULL,
`status` tinyint(1) DEFAULT '1',
`resetPasswordExpires` datetime DEFAULT NULL,
`resetPasswordToken` varchar(255) DEFAULT NULL,
`createdAt` datetime NOT NULL,
`updatedAt` datetime NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `email` (`email`),
KEY `roleId` (`roleId`),
CONSTRAINT `Users_ibfk_1` FOREIGN KEY (`roleId`) REFERENCES `roles` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=884 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
/*!40101 SET character_set_client = #saved_cs_client */;
now I want to migrate user from old database to new database.
this is only one table, we have many tables to migrate data.
how can I achieve that ?
also we have done normalization in new database like
old.sql one table separated in 2 or 3 new tables in new database.
These DBs are on the same MySQL instance.
You can use a simple script like:
INSERT INTO
user (id, email, password, firstName, lastName, phoneNumber, role, createdOn)
SELECT
id, email, password, firstName, lastName, null, IF(roleId = 1, 'ADMIN', 'USER'), created
FROM users;
Just set correct roleId for condition and remove id if you need a new one.
Tiny example of the data transferring realization with some remarks: DEMO fiddle
The following sql script causes the Error Code: 1215. Cannot add foreign key constraint in MySQL Workbench
DROP TABLE IF EXISTS `bookings`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `bookings` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`van_id` int(11) NOT NULL,
`driver_id` int(11) NOT NULL,
`route_id` int(11) NOT NULL,
`registered_seats` int(11) NOT NULL,
`departure_time` varchar(11) NOT NULL,
`arival_time` varchar(11) NOT NULL,
`departure_date` varchar(11) NOT NULL,
`total_cost` int(11) NOT NULL,
`expected_price` int(11) NOT NULL,
PRIMARY KEY (`id`),
FOREIGN KEY (`van_id`) REFERENCES `van` (`id`) ON DELETE SET NULL,
FOREIGN KEY (`driver_id`) REFERENCES `driver` (`id`) ON DELETE SET NULL,
FOREIGN KEY (`route_id`) REFERENCES `route` (`id`) ON DELETE SET NULL
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
For reference, below are the scripts of the related tables, all of these work fine.
For table van,
DROP TABLE IF EXISTS `van`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `van` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`vehicle_registration` varchar(45) NOT NULL UNIQUE,
`vehicle_type` varchar(45) NOT NULL,
`total_seats` int(11) NOT NULL,
`category` varchar(45) NOT NULL,
`flagged` int(2) DEFAULT 0 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
For table Driver,
DROP TABLE IF EXISTS `driver`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `driver` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`first_name` varchar(45) NOT NULL ,
`last_name` varchar(45) DEFAULT NULL,
`cnic` varchar(45) NOT NULL UNIQUE,
`license_number` varchar(11) NOT NULL UNIQUE,
`phonenumber` int(11) NOT NULL unique,
`picture` varchar(15) NOT NULL unique,
`flagged` int(2) DEFAULT 0,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
For table route,
DROP TABLE IF EXISTS `route`;
/*!40101 SET #saved_cs_client = ##character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `route` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`source` varchar(45) NOT NULL,
`destination` varchar(45) NOT NULL,
`exp_t_time` varchar(45) NOT NULL,
`eco_fare` int(11) NOT NULL,
`ac_fare` int(11) NOT NULL,
`state` varchar(45) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
I was trying to SET NULL an attribute (in the foreign key constraint) that is supposed to be NOT NULL.
I made the following changes in the bookings mysql script.
Before:
FOREIGN KEY (`van_id`) REFERENCES `van` (`id`) ON DELETE SET NULL,
FOREIGN KEY (`driver_id`) REFERENCES `driver` (`id`) ON DELETE SET NULL,
FOREIGN KEY (`route_id`) REFERENCES `route` (`id`) ON DELETE SET NULL
After:
FOREIGN KEY (`van_id`) REFERENCES `van` (`id`) ON DELETE CASCADE,
FOREIGN KEY (`driver_id`) REFERENCES `driver` (`id`) ON DELETE CASCADE,
FOREIGN KEY (`route_id`) REFERENCES `route` (`id`) ON DELETE CASCADE
First, here's my main reference table mysql dump
-- phpMyAdmin SQL Dump
-- version 4.1.14
-- http://www.phpmyadmin.net
--
-- Host: 127.0.0.1
-- Generation Time: Nov 17, 2015 at 03:15 AM
-- Server version: 5.6.17
-- PHP Version: 5.5.12
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: `j_inventory`
--
-- --------------------------------------------------------
--
-- Table structure for table `users`
--
CREATE TABLE IF NOT EXISTS `users` ( `user_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `username` varchar(200) COLLATE utf8_unicode_ci NOT NULL, `password` varchar(500) COLLATE utf8_unicode_ci NOT NULL, `real_password` varchar(250) COLLATE utf8_unicode_ci NOT NULL, `role` varchar(50) COLLATE utf8_unicode_ci NOT NULL, `full_name` varchar(250) COLLATE utf8_unicode_ci NOT NULL, `remember_token` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL, `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `status` varchar(100) COLLATE utf8_unicode_ci NOT NULL, PRIMARY KEY (`user_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=44 ;
/*!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 */;
and the second table where the hopefully the foreign key resides
-- phpMyAdmin SQL Dump
-- version 4.1.14
-- http://www.phpmyadmin.net
--
-- Host: 127.0.0.1
-- Generation Time: Nov 17, 2015 at 03:14 AM
-- Server version: 5.6.17
-- PHP Version: 5.5.12
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: `j_inventory`
--
-- --------------------------------------------------------
--
-- Table structure for table `user_details`
--
CREATE TABLE IF NOT EXISTS `user_details` ( `id` int(11) NOT NULL AUTO_INCREMENT, `phone` varchar(200) NOT NULL, `age` int(100) NOT NULL, `gender` varchar(50) NOT NULL, `address` varchar(250) NOT NULL, `course` varchar(250) NOT NULL, `college` varchar(200) NOT NULL, `year` int(11) NOT NULL, `user_id` int(100) NOT NULL, `updated_at` timestamp NOT NULL, `created_at` timestamp NOT NULL, PRIMARY KEY (`id`), KEY `user_id` (`user_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;
/*!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 */;
the foreign key (not set up due to mysql error "Cannot add foreign key constraint ") in the users_details is the 'user_id' and the reference table is the 'users' table where the reference key for the foreign key is the 'user_id' on the users table and I tried this
ALTER TABLE user_details ADD FOREIGN KEY fk1(user_id) REFERENCES
users(user_id) ON DELETE CASCADE ON UPDATE NO ACTION;
but sadly and unfortunately it throws me an error
Error SQL query:
ALTER TABLE user_details ADD CONSTRAINT fk1 FOREIGN KEY
(user_id) REFERENCES j_inventory.users(user_id) ON DELETE
CASCADE ON UPDATE NO ACTION; MySQL said: Documentation
1215 - Cannot add foreign key constraint Documentation
any help, clues, ideas, suggestions, recommendations please?
Your user id is unsigned on the users table. Remove 'unsigned' from this field in your users table create statement and see if it works. I think what you're seeing is an error caused by a mismatch between the user_id field types on your users and user_details tables