I've trying to create a foreign key from a table to another, using the tools that MySQL Workbench provides, but all that I get is this error:
ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (`mediacom`.`#sql-758_4`, CONSTRAINT `med_agente_ibfk_1` FOREIGN KEY (`id_agenzia`) REFERENCES `med_agenzia` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION)
SQL Statement:
ALTER TABLE `mediacom`.`med_agente`
ADD CONSTRAINT `med_agente_ibfk_1`
FOREIGN KEY (`id_agenzia`)
REFERENCES `mediacom`.`med_agenzia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION
The thing that confuses me the most is the line mediacom.#sql-758_4, since the real query that I use is :
ALTER TABLE `mediacom`.`med_agente`
ADD INDEX `med_agente_ibfk_1_idx` (`id_agenzia` ASC) COMMENT '';
ALTER TABLE `mediacom`.`med_agente`
ADD CONSTRAINT `med_agente_ibfk_1`
FOREIGN KEY (`id_agenzia`)
REFERENCES `mediacom`.`med_agenzia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION;
The index is inserted fine but the rest is ignored, why?
This is the med_agente table
CREATE TABLE `med_agente` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`nome` varchar(225) DEFAULT NULL,
`cognome` varchar(225) DEFAULT NULL,
`disabilitato` tinyint(1) DEFAULT NULL,
`mod_time` datetime DEFAULT NULL,
`mod_user` varchar(255) DEFAULT NULL,
`codmobile` decimal(13,0) DEFAULT NULL,
`codfisso` decimal(13,0) DEFAULT NULL,
`id_agenzia` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `med_agente_ibfk_1_idx` (`id_agenzia`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
And this is med_agenzia
CREATE TABLE `med_agenzia` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ragSociale` varchar(255) NOT NULL,
`descrizione` varchar(255) DEFAULT NULL,
`indirizzo` varchar(255) DEFAULT NULL,
`citta` varchar(255) DEFAULT NULL,
`CAP` int(11) DEFAULT NULL,
`provincia` varchar(255) DEFAULT NULL,
`tel` int(11) DEFAULT NULL,
`mail` varchar(255) DEFAULT NULL,
`codFiscale` varchar(255) DEFAULT NULL,
`pIVA` varchar(255) DEFAULT NULL,
`id_azsuper` int(11) DEFAULT NULL,
`disabilitato` tinyint(1) DEFAULT NULL,
`mod_time` datetime DEFAULT NULL,
`mod_user` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
where's the problem???
Before you run your query
Run this :
SET FOREIGN_KEY_CHECKS=0;
Then set it to 1
SET FOREIGN_KEY_CHECKS=1;
after you run your Alter query.
Related
I keep getting errors when I try to run the relational part of the database to pull the 3 columns in the relation table from the customer table and bill table.
DROP DATABASE IF EXISTS CreateDB2;
CREATE DATABASE CreateDB2;
USE CreateDB2;
CREATE TABLE `tbl_employee` (
`tbl_EmployeeName` varchar(20) NOT NULL,
`tbl_Department` varchar(15) NOT NULL,
`employee_id` int(11) NOT NULL AUTO_INCREMENT,
`department_location` varchar(20) NOT NULL,
`department_name` varchar(15) NOT NULL,
`supervisor` varchar(15) NOT NULL,
PRIMARY KEY (`employee_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `customer` (
`c_ID` varchar(15) NOT NULL,
`c_address` varchar(50) NOT NULL,
`c_Time` time NOT NULL,
`c_order` int(100) NOT NULL,
PRIMARY KEY (`c_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `bill` (
`b_items` double DEFAULT NULL,
`b_price` double DEFAULT NULL,
`b_discount` double DEFAULT NULL,
`b_deliveryFee` double DEFAULT NULL,
`b_tax` double DEFAULT NULL,
`b_tip` double DEFAULT NULL,
`b_total` double NOT NULL,
`quantity` int(11) NOT NULL,
PRIMARY KEY (`b_total`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `food` (
`code` int(11) NOT NULL AUTO_INCREMENT,
`f_catagory` varchar(20) NOT NULL,
`f_item` varchar(10) NOT NULL,
`f_info` varchar(50) NOT NULL,
`f_price` int(11) NOT NULL,
PRIMARY KEY (`code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `restaurantinfo` (
`name` varchar(20) NOT NULL,
`address` varchar(50) DEFAULT NULL,
`phone` int(13) DEFAULT NULL,
`email` varchar(20) DEFAULT NULL,
PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `relationaltable` (
`c_ID` varchar(15) NOT NULL,
`c_order` int(100) NOT NULL,
`b_total` double NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
ALTER TABLE `customer` ADD CONSTRAINT `c_ID` FOREIGN KEY (`c_ID`) REFERENCES `relationaltable`(`c_ID`) ON DELETE RESTRICT ON UPDATE RESTRICT;
ALTER TABLE `order` ADD CONSTRAINT `c_order` FOREIGN KEY (`c_order`) REFERENCES `relationaltable`(`c_order`) ON DELETE RESTRICT ON UPDATE RESTRICT;
ALTER TABLE `bill` ADD CONSTRAINT `b_total` FOREIGN KEY (`b_total`) REFERENCES `relationaltable`(`b_total`) ON DELETE RESTRICT ON UPDATE RESTRICT;
On the last part here, it is not working. It gives error code 1005
The alter table at the bottom is the probably the issue. I am just not sure how to fix it. Any help is appreciated. Thanks.
The foreign key is incorrectly formed.
You connect customer.c_ID should be equal to relationaltable.c_order
customer.c_ID is varchar(15) NOT NULL
relationaltable.c_order is int(100) NOT NULL
The data type and also the length has to be matching
In my MySQL query I'm getting this error:
Cannot add foreign key constraint error
What could be the reason?
CREATE TABLE `social_account` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) DEFAULT NULL,
`type` enum('facebook','Twitter') DEFAULT NULL,
`pageid` varchar(200) DEFAULT NULL,
`accesstoken` varchar(200) DEFAULT NULL,
`pagename` varchar(200) DEFAULT NULL,
`ProfilePicture` varchar(200) DEFAULT NULL,
`page_url` varchar(300) DEFAULT NULL,
`accesstokensecreat` varchar(200) DEFAULT NULL,
`is_expire` int(1) DEFAULT '0',
PRIMARY KEY (`ID`),
KEY `fk_user_social_account` (`user_id`),
CONSTRAINT `fk_user_social_account` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4
may be Your Foreign key datatype is not matched with the referring table
I have created a database "webportal". and this is my "user" table script
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) DEFAULT NULL,
`password` varchar(255) DEFAULT NULL,
`firstName` varchar(255) DEFAULT NULL,
`lastName` varchar(255) DEFAULT NULL,
`dateRegistered` DATE DEFAULT NULL,
`skypeID` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
and this one is "catalog" table script.
DROP TABLE IF EXISTS `catalog`;
create table catalog(
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`link` VARCHAR(100) NOT NULL,
`comment` VARCHAR(100) NOT NULL,
`inserDate` DATE DEFAULT NULL,
`content` longblob NOT NULL,
PRIMARY KEY (`id`),
CONSTRAINT `fk_catalog` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
and when I try to execute the second script in the command line, I get this error...
ERROR 1215 (HY000): Cannot add foreign key constraint.
What is wrong with this code?
It seems you are using a old version of MySQL, you can add a INDEX clause to foreign key field to fix the problem:
DROP TABLE IF EXISTS `catalog`;
create table `catalog`(
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`link` VARCHAR(100) NOT NULL,
`comment` VARCHAR(100) NOT NULL,
`inserDate` DATE DEFAULT NULL,
`content` longblob NOT NULL,
PRIMARY KEY (`id`),
INDEX (`user_id`),
CONSTRAINT `fk_catalog` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I have two tables on distinct schemas
db1.invoice
CREATE TABLE IF NOT EXISTS db1.`invoice` (
`invoice_id` int(11) NOT NULL AUTO_INCREMENT,
`qsales_sale_id` int(11) DEFAULT NULL,
`invoice_id_from_dosage_id` int(11) NOT NULL,
`number` int(11) DEFAULT NULL,
`enterprise_name` varchar(100) DEFAULT NULL,
`subsidiary_name` varchar(100) DEFAULT NULL,
`subsidiary_address` varchar(200) DEFAULT NULL,
`subsidiary_phone` varchar(40) DEFAULT NULL,
`client_name` varchar(200) DEFAULT NULL,
`nit` bigint(20) DEFAULT NULL,
`was_paid` tinyint(1) DEFAULT NULL,
PRIMARY KEY (`invoice_id`),
KEY `fk_invoice_qsales_sale1_idx` (`qsales_sale_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=457 ;
bd2.qsale_sale
CREATE TABLE IF NOT EXISTS db2.qsales_sale (
`qsales_sale_id` int(11) NOT NULL AUTO_INCREMENT,
`qsales_order_type_id` int(11) NOT NULL,
`client_id` int(11) NOT NULL,
`total_cost` decimal(10,2) DEFAULT NULL,
`currency` varchar(45) DEFAULT NULL,
`created_at` datetime DEFAULT NULL,
`has_discount` tinyint(1) DEFAULT NULL,
`created_by` int(11) NOT NULL,
`is_wholesaler` tinyint(1) NOT NULL DEFAULT '0',
`payment_type` varchar(65) DEFAULT NULL,
PRIMARY KEY (`qsales_sale_id`),
KEY `fk_qsales_sale_qsales_order_type1_idx` (`qsales_order_type_id`),
KEY `fk_qsales_sale_client1_idx` (`client_id`),
KEY `fk_qsales_sale_employee1_idx` (`created_by`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=51 ;
then i want to add a foreign key
I try:
1.
alter table bd1.invoice
add foreign key fk_invoice_qsales_sale1(qsales_sale_id)
references db2.qsales_sale (qsales_sale_id)
on delete cascade
on update cascade;
ALTER TABLE db1.invoice
ADD CONSTRAINT fk_invoice_qsales_sale1 FOREIGN KEY (qsales_sale_id)
REFERENCES db2.qsales_sale (qsales_sale_id) ON DELETE NO ACTION ON UPDATE NO ACTION;
But i have this error:
Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`qfix`.`#sql-a28_5`, CONSTRAINT `#sql-a28_5_ibfk_1` FOREIGN KEY (`qsales_sale_id`) REFERENCES `qsales`.`qsales_sale` (`qsales_sale_id`) ON DELETE CASCADE ON UPDATE CASCADE)
0.625 sec
I'm trying to add a foreign key constraint on my schema devair from field user_id of table bluePrints to the PK id of table users but I get an error:
ERROR 1215: Cannot add foreign key constraint
Here are my table definitions:
users:
CREATE TABLE `users` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`email` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`password` varchar(60) COLLATE utf8_unicode_ci NOT NULL,
`remember_token` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `users_email_unique` (`email`)
) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
bluePrints:
CREATE TABLE `bluePrints` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`bluePrintName` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`description` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`user_id` int(10) NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `uid` (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
And the offending alter table statement:
ALTER TABLE `devair`.`bluePrints`
ADD CONSTRAINT `bp_u`
FOREIGN KEY (user_id)
REFERENCES `devair`.`users` (id)
ON DELETE CASCADE
ON UPDATE CASCADE;
The simple answer would be that you need to do this:
ALTER TABLE table1 ADD CONSTRAINT fk_bp_id FOREIGN KEY (columnFromTable1) REFERENCES table2(columnReferencedFromTable2);
The problem is the 'unsigned' in the bluePrints table. Once it's unsigned, then it works.
Now i have to figure out how to get laravel to use unsigned.