So I have two tables, customers and appointments.
Im trying to create a very simple FK relation between appointments.customer_id and customers.id, however when I do my ALTER TABLE trying to add the FK im getting this error:
MySQL said: Cannot add or update a child row: a foreign key constraint fails (wax.#sql-2c5_100, CONSTRAINT customer_fk FOREIGN KEY (id) REFERENCES customers (id) ON DELETE CASCADE ON UPDATE CASCADE)
This constraint "#sql-2c5_100" seems to be some randomly generated constraint, that I can not find ANYWHERE. I've looked on every table on the database, ive looked on all the tables on the information schema and it simply does not exist.
Thanks!
Edit:
Here's the create table outputs
CREATE TABLE `appointments` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`customer_id` int(11) unsigned NOT NULL,
`name` varchar(255) DEFAULT NULL
PRIMARY KEY (`id`),
KEY `customer_id` (`customer_id`)
) ENGINE=InnoDB AUTO_INCREMENT=290958 DEFAULT CHARSET=utf8;
CREATE TABLE `customers` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`first_name` varchar(255) NOT NULL DEFAULT '',
`last_name` varchar(255) NOT NULL DEFAULT '',
`phone` varchar(20) DEFAULT NULL
PRIMARY KEY (`id`),
KEY `sf_id` (`sf_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Related
I´m trying to create Foreign Keys in phpmyadmin, but I get this error:
Error creating foreign key on revision (check data types)
I don´t understand it because the data types are equal. So, what I want is to create a Foreign Key from 'acoustictreatment' to 'filterspecifications' which contains tag, offerid and revision. But I get the error that I mentioned.
This are my tables:
CREATE TABLE `offer` (
`projectid` varchar(20) NOT NULL,
`customer` varchar(255) NOT NULL,
`creator` varchar(255) NOT NULL,
`date` date NOT NULL,
`revision` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
ALTER TABLE `offer`
ADD PRIMARY KEY (`projectid`,`revision`);
CREATE TABLE `filterspecifications` (
`tag` varchar(100) NOT NULL,
`gasFlow` double NOT NULL,
`dustToHandle` double NOT NULL,
`offerid` varchar(20) NOT NULL,
`selectedFilter` varchar(20) NOT NULL,
`revision` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
ALTER TABLE `filterspecifications`
ADD PRIMARY KEY (`tag`,`offerid`,`revision`),
ADD KEY `offerid` (`offerid`,`revision`);
ALTER TABLE `filterspecifications`
ADD CONSTRAINT `filterspecifications_ibfk_1`
FOREIGN KEY (`offerid`,`revision`) REFERENCES `offer` (`projectid`, `revision`) ON DELETE CASCADE ON UPDATE CASCADE;
CREATE TABLE `acoustictreatment` (
`tag` varchar(100) NOT NULL,
`offerid` varchar(20) NOT NULL,
`outputFanSilencer` tinyint(1) NOT NULL,
`fanAcousticInsulation` tinyint(1) NOT NULL,
`revision` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
ALTER TABLE `acoustictreatment`
ADD PRIMARY KEY (`tag`,`offerid`,`revision`);
The solution that I found is to delete the 'acoustictreatment' table and create it again with the foreign key from the beginning. Because what I was trying to do was to create all the tables and then create the foreign keys, but that didn´t work for me
CREATE TABLE `class` (
`class_id` int(11) NOT NULL AUTO_INCREMENT,
`section_name` varchar(50) NOT NULL,
`class_alias` varchar(200) NOT NULL,
`grading_scheme` int(11) NOT NULL DEFAULT '0',
`year` year(4) NOT NULL,
`grade_calc_method_id` varchar(20) DEFAULT NULL,
PRIMARY KEY (`class_id`)
) ENGINE=InnoDB AUTO_INCREMENT=48819 DEFAULT CHARSET=latin1;
CREATE TABLE `teachers` (
`teacher_id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`teacher_subject` varchar(20) NOT NULL DEFAULT 'None',
PRIMARY KEY (`teacher_id`),
KEY `user_id` (`user_id`,`school_id`)
) ENGINE=InnoDB AUTO_INCREMENT=48606 DEFAULT CHARSET=latin1;
CREATE TABLE `teacher_classes` (
`teacher_class_id` int(11) NOT NULL AUTO_INCREMENT,
`teacher_id` int(11) NOT NULL,
`class_id` int(11) NOT NULL,
PRIMARY KEY (`teacher_class_id`),
UNIQUE KEY `teacher_id_class_id` (`teacher_id`,`class_id`),
KEY `teacher_id` (`teacher_id`,`class_id`)
) ENGINE=InnoDB AUTO_INCREMENT=46707 DEFAULT CHARSET=latin1;
Trying to insure data consistency between the tables by using foreign key so that the DBMS can check for errors.I have another junction table teacher_classes
Here is my query to add foreign keys constraint
ALTER TABLE teacher_classes
ADD CONSTRAINT `tc_fk_class_id` FOREIGN KEY (`class_id`)
REFERENCES class (`class_id`) ON UPDATE NO ACTION ON DELETE NO ACTION,
ADD CONSTRAINT `tc_fk_teacher_id` FOREIGN KEY (`teacher_id`)
REFERENCES teachers (`teacher_id`) ON UPDATE NO ACTION ON DELETE NO ACTION;
've seen the other posts on this topic, but no luck, getting following error.
Cannot add or update a child row: a foreign key constraint fails
(DB_NAME.#sql-403_12, CONSTRAINT
tc_fk_teacher_id FOREIGN KEY (teacher_id) REFERENCES teachers
(teacher_id) ON DELETE NO ACTION ON UPDATE NO ACTION)
Too late to Answer. I just had the same problem the solution is easy.
You're getting this error because you're trying to or UPDATE a row to teacher_classes doesn't match the id in table teachers.
A simple solution is disable foreign key checks before performing any operation on the table.
SET FOREIGN_KEY_CHECKS = 0;
After you are done with the table enable it again.
SET FOREIGN_KEY_CHECKS = 1;
Or you can remove not null constraint and insert a NULL value in it.
That's most probably the column definition doesn't match properly. For table teachers the PK column definition is as below.
`teacher_id` int(11) NOT NULL AUTO_INCREMENT
Make sure you have the same definition in your child table teacher_classes
I'm facing a really odd problem with MySQL, I got this following error when adding a new row :
Cannot add or update a child row: a foreign key constraint fails (gestikids_demo.child_moments, CONSTRAINT fk_child_moments_moment_16 FOREIGN KEY (moment_id) REFERENCES moments (id))
But I correctly add an existing moment_id in my entry. Here's the tables defintions :
CREATE TABLE `child_moments` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`child_id` bigint(20) DEFAULT NULL,
`moment_id` bigint(20) DEFAULT NULL,
`day` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `uq_child_moments_1` (`child_id`,`moment_id`,`day`),
KEY `ix_child_moments_child_15` (`child_id`),
KEY `ix_child_moments_moment_16` (`moment_id`),
CONSTRAINT `fk_child_moments_child_15` FOREIGN KEY (`child_id`) REFERENCES `childs` (`id`),
CONSTRAINT `fk_child_moments_moment_16` FOREIGN KEY (`moment_id`) REFERENCES `moments` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=196596 DEFAULT CHARSET=latin1
CREATE TABLE `moments` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`is_meal` tinyint(1) DEFAULT '0',
`sort` int(11) DEFAULT NULL,
`pole_id` bigint(20) DEFAULT NULL,
`type_id` bigint(20) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `ix_moments_pole_72` (`pole_id`),
KEY `ix_moments_type_73` (`type_id`)
) ENGINE=MyISAM AUTO_INCREMENT=117 DEFAULT CHARSET=latin1
What is wrong ?
I tested to enter manually the data, and all the fields are populated with existing IDs, but the insert fail.
Thank you for your help.
Update: If I insert a data with no moment_id, the insert is successful. I checked if the foreign key is correctly written (no mistakes in the constraints) but it doesn't seems.
Update 2:
I tried recreating a simplified version of those two tables in an other database to see if the error was really about them, and I had the following error :
Can't create table 'child_moments' (errno: 150)
The insert was the following :
CREATE TABLE `child_moments` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`moment_id` bigint(20) DEFAULT NULL,
`day` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `uq_child_moments_1` (`moment_id`,`day`),
KEY `ix_child_moments_moment_16` (`moment_id`),
CONSTRAINT `fk_child_moments_moment_16` FOREIGN KEY (`moment_id`) REFERENCES `moments` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE `moments` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`is_meal` tinyint(1) DEFAULT '0',
`sort` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
) ENGINE=MyISAM DEFAULT CHARSET=latin1
And if I remove the following lines, the insert works successfully :
KEY `ix_child_moments_moment_16` (`moment_id`),
CONSTRAINT `fk_child_moments_moment_16` FOREIGN KEY (`moment_id`) REFERENCES `moments` (`id`)
So the problem is clearly located at these lines, but I can't explain what and why :/
I finally found the problem, thanks to MySQL Creating tables with Foreign Keys giving errno: 150
It's in fact really simple : the two tables does not have the same engine ! Yes, moments is MyISAM and child_moment is InnoDB.
Switching both to InnoDB fixed the issue for me.
Hope it'll helps others too!
Does anybody know why I have the error
Error Code: 1215. Cannot add foreign key constraint
When I try
ALTER TABLE hermanos ADD CONSTRAINT fk_hno_provincia FOREIGN KEY (provincia) REFERENCES p_provincias (id)
On these tables:
CREATE TABLE IF NOT EXISTS `hermanos` (
`codigo` int(11) NOT NULL AUTO_INCREMENT,
`nombre` varchar(255) NOT NULL,
`apellidos` varchar(255) NOT NULL,
`direccion` varchar(255) NOT NULL,
`codigoPostal` int(11) NOT NULL,
`provincia` int(11) NOT NULL,
`numeroHermano` int(11) NOT NULL,
`dni` varchar(9) NOT NULL,
`tipoCuota` int(11) NOT NULL,
`sexo` int(11) NOT NULL,
PRIMARY KEY (`codigo`),
KEY `sexo` (`sexo`),
KEY `pk_hno_cuota` (`tipoCuota`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ;
CREATE TABLE IF NOT EXISTS `p_provincias` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`nombre` varchar(125) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=53 ;
Thanks
The parent and child tables must use the same storage engine.
I noticed that hermanos uses InnoDB and p_provincias uses MyISAM.
For more info, see here
Foreign keys definitions are subject to the following conditions:
Foreign key relationships involve a parent table that holds the
central data values, and a child table with identical values pointing
back to its parent. The FOREIGN KEY clause is specified in the child
table. The parent and child tables must use the same storage engine.
They must not be TEMPORARY tables.
I want to create a database and connect it with two database. But I don't know when i create the Foreign Key to the second database (time_shift table) it always result error 150;
Here is the structure of table outlet:
And this is structure of table time_shift:
And this the query to create new table tide_cart:
create table `tide_chart` (
`id` int(10) not null auto_increment primary key,
`date` date null,
`outletId` int(11) not null,
`timeShiftId` int(11) not null,
`value` varchar(255) not null,
unique (`date`, `outletId`, `timeShiftId`),
foreign key (`outletId`) references `outlet`(`id`)
ON update cascade ON delete cascade,
foreign key (`timeShiftId`) references `time_shift`(`id`)
ON update cascade ON delete cascade
) engine=innoDB;
Please explain to me, why i get error when try to make foreign key connect to table time_shift?
Update: add dump export structure table for outlet and time_shift:
CREATE TABLE `outlet` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=5 ;
CREATE TABLE `time_shift` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`time_start` time NOT NULL,
`time_end` time NOT NULL,
`is_active` tinyint(4) NOT NULL DEFAULT '1',
`ref_area` int(11) NOT NULL DEFAULT '1',
PRIMARY KEY (`id`),
KEY `ref_area` (`ref_area`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=7 ;
You need to use the InnoDB engine for your tables. time_shift is using MyISAM.
You must define indexes for outletId and timeShiftId (either UNIQUE or KEY as needed) in order to be able to create a foreign key using that field.