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.
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
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;
When I'm going to execute this code, I'm getting this error message:
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 'ADD CONSTRAINT fk_pay_grade_scale FOREIGN KEY pay_scale_id
REFERENCES `pay_s' at line 11
But I don't understand the problem. Your help is appreciated!
CREATE TABLE IF NOT EXISTS `pay_grades` (
`pay_grade_id` int(20) NOT NULL,
`pay_scale_id` tinyint(4) NOT NULL,
`name` varchar(100) NOT NULL,
`basic_salary` decimal(10,2) NOT NULL,
`status` int(2) NOT NULL DEFAULT '1',
PRIMARY KEY (`pay_grade_id`),
INDEX (`pay_scale_id`, `pay_grade_id`),
ADD CONSTRAINT `fk_pay_grade_scale` FOREIGN KEY `pay_scale_id` REFERENCES `pay_scales`(`id`) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `pay_scales` (
`id` tinyint(4) NOT NULL,
`name` varchar(100) NOT NULL,
PRIMARY KEY(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
You can not use ADD CONSTRAINT in a CREATE TABLE declaration.
Declare your constraint after creating the table or in the CREATE TABLE.
First solution: Add the constraint in CREATE TABLE
CREATE TABLE IF NOT EXISTS `pay_grades` (
`pay_grade_id` int(20) NOT NULL,
`pay_scale_id` tinyint(4) NOT NULL,
`name` varchar(100) NOT NULL,
`basic_salary` decimal(10,2) NOT NULL,
`status` int(2) NOT NULL DEFAULT '1',
PRIMARY KEY (`pay_grade_id`),
INDEX (`pay_scale_id`, `pay_grade_id`),
FOREIGN KEY (`pay_scale_id`) REFERENCES `pay_scales`(`id`) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Second solution: Alter table to add the constraint
Create your table without the constraint, and then add your constraint as follow:
ALTER TABLE `pay_grades`
ADD CONSTRAINT `pay_scale_id` FOREIGN KEY REFERENCES `pay_scales`(`id`)
ON UPDATE CASCADE ON DELETE RESTRICT;
MySQL documentation for foreign keys declaration.
It seems the difference in order of table creation. First create primary key table than create the table of foreign key.
CREATE TABLE IF NOT EXISTS `pay_scales` (
`id` tinyint(4) NOT NULL,
`name` varchar(100) NOT NULL,
PRIMARY KEY(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `pay_grades` (
`pay_grade_id` int(20) NOT NULL,
`pay_scale_id` tinyint(4) NOT NULL,
`name` varchar(100) NOT NULL,
`basic_salary` decimal(10,2) NOT NULL,
`status` int(2) NOT NULL DEFAULT '1',
PRIMARY KEY (`pay_grade_id`),
INDEX (`pay_scale_id`, `pay_grade_id`),
ADD CONSTRAINT `fk_pay_grade_scale` FOREIGN KEY `pay_scale_id` REFERENCES `pay_scales`(`id`) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I have this weird issue with creation of foreign key.
Given 2 tables:
CREATE TABLE IF NOT EXISTS `groupdeals` (
`groupdeals_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`product_id` int(10) NOT NULL,
`merchant_id` int(11) NOT NULL,
`minimum_qty` int(11) NOT NULL,
`maximum_qty` int(11) NOT NULL,
`target_met_email` int(11) NOT NULL,
`coupon_barcode` text NOT NULL,
`coupon_merchant_address` int(11) NOT NULL,
`coupon_merchant_contact` int(11) NOT NULL,
`coupon_expiration_date` date DEFAULT NULL,
`coupon_price` int(11) NOT NULL,
`coupon_fine_print` int(11) NOT NULL,
`coupon_highlights` int(11) NOT NULL,
`coupon_merchant_description` int(11) NOT NULL,
`coupon_business_hours` int(11) NOT NULL,
`coupon_merchant_logo` int(11) NOT NULL,
`coupon_additional_info` text NOT NULL,
`position` int(11) NOT NULL,
PRIMARY KEY (`groupdeals_id`),
KEY `groupdeals_id` (`groupdeals_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
and
CREATE TABLE IF NOT EXISTS `groupdeals_coupons` (
`coupon_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`groupdeals_id` int(11) NOT NULL,
`order_item_id` int(11) NOT NULL,
`coupon_code` varchar(255) NOT NULL DEFAULT '',
`redeem` varchar(255) NOT NULL DEFAULT '',
`status` varchar(255) NOT NULL DEFAULT '',
PRIMARY KEY (`coupon_id`),
KEY `fk_groupdeals_coupons_groupdeals1_idx` (`groupdeals_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I try to add foreign key by executing following query:
ALTER TABLE `groupdeals_coupons`
ADD CONSTRAINT `fk_groupdeals_coupons_groupdeals1`
FOREIGN KEY (`groupdeals_id`)
REFERENCES `groupdeals` (`groupdeals_id`)
ON DELETE CASCADE
ON UPDATE CASCADE;
All I receive is Error:
#1215 - Cannot add foreign key constraint
Show engine innodb status
------------------------
LATEST FOREIGN KEY ERROR
------------------------
2013-08-17 13:47:49 7ff5dbb2c700 Error in foreign key constraint of table xxxxx/#sql-7b23_282b1a:
FOREIGN KEY (`groupdeals_id`)
REFERENCES `groupdeals` (`groupdeals_id`)
ON DELETE CASCADE
ON UPDATE CASCADE:
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.
Note that the internal storage type of ENUM and SET changed in
tables created with >= InnoDB-4.1.12, and such columns in old tables
cannot be referenced by such columns in new tables.
See http://dev.mysql.com/doc/refman/5.6/en/innodb-foreign-key-constraints.html
for correct foreign key definition.
The column groupdeals.groupdeals_id is a primary one, so I really can't understand where is a problem :|
Any hints?
Server type: Percona Server
Server version: 5.6.11-rc60.3-log - Percona Server (GPL), Release 60.3
Your types are inconsistent:
CREATE TABLE IF NOT EXISTS `groupdeals` (
`groupdeals_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
CREATE TABLE IF NOT EXISTS `groupdeals_coupons` (
[...]
`groupdeals_id` int(11) NOT NULL,
As you will see, in one table you have int unsigned. In the other, just int.
BTW, I noticed you have two keys on groupdeals_id. Is that on purpose?
CREATE TABLE IF NOT EXISTS `groupdeals` (
[...]
PRIMARY KEY (`groupdeals_id`),
KEY `groupdeals_id` (`groupdeals_id`)
Try these two steps to add foreign key:-
alter table groupdeals_coupons modify groupdeals_id int unsigned not null default 0;
ALTER TABLE groupdeals_coupons ADD CONSTRAINT fk_groupdeals_coupons_groupdeals1 FOREIGN KEY (groupdeals_id) references groupdeals (roupdeals_id);
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.