Cannot Add Foreign Key Constraint Error 1452
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Error 1215: Cannot Add Foreign Key Constraint
or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow cannot add foreign key constraint error code 1215 Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up ERROR 1452: Cannot add or update a child error 1215 (hy000): cannot add foreign key constraint row: a foreign key constraint fails up vote 30 down vote favorite 6 I have created tables in MySQL Workbench as shown below : ORDRE table: Create table Ordre( OrdreID int NOT NULL, OrdreDato date DEFAULT NULL, KundeID int DEFAULT NULL, constraint Ordre_pk primary key(OrdreID), constraint Ordre_fk foreign key(KundeID) references Kunde(KundeID) ) engine = InnoDB; PRODUKT table: Create table Produkt( ProduktID int NOT NULL, ProduktBeskrivelse varchar(100) DEFAULT
Cannot Add Or Update A Child Row: A Foreign Key Constraint Fails
NULL, ProduktFarge varchar(20) DEFAULT NULL, Enhetpris int DEFAULT NULL, constraint Produkt_pk primary key(ProduktID) ) engine = InnoDB; and ORDRELINJE table: Create table Ordrelinje( Ordre int NOT NULL, Produkt int NOT NULL, AntallBestilt int DEFAULT NULL, constraint Ordrelinje_pk primary key(Ordre, Produkt), constraint Ordrelinje_fk foreign key(Ordre) references Ordre(OrdreID), constraint Ordrelinje_fk1 foreign key(Produkt) references Produkt(ProduktID) ) engine = InnoDB; so when I try to insert values into ORDRELINJE table i get : Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (srdjank.Ordrelinje, CONSTRAINT Ordrelinje_fk FOREIGN KEY (Ordre) REFERENCES Ordre (OrdreID)) I've seen the other posts on this topic, but no luck. Am I overseeing something or ... Any idea what to do? mysql mysql-error-1452 share|improve this question edited Feb 9 '14 at 14:34 Mihai 15.3k52442 asked Feb 9 '14 at 13:37 user3289677 151123 1 possible duplicate of Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails –Sagar Naliyapara Jul 16 '15 at 5:07 add a comment| 3 Answers 3 active oldest votes up vote 41 down vote Taken from Using FOREIGN KEY Constraints Foreign key relationships involve a parent table that holds the central data values, and a chi
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Cannot Add Foreign Key Constraint Django
of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up 1452 - Cannot add or update a child row: a foreign key constraint fails up vote 11 http://stackoverflow.com/questions/21659691/error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails down vote favorite 4 I'm getting this error: 1452 - Cannot add or update a child row: a foreign key constraint fails. I've located them and try to get rid of the references with "alter table tillhör drop foreign key kat_id;" But getting this error instead: #1025 - Error on rename of '.\recept\tillh@1ir' to '.\recept#sql2-1570-3cb' (errno: 152). What do I do wrong? mysql sql foreign-keys share|improve this question edited Sep 23 http://stackoverflow.com/questions/18965424/1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails '13 at 17:52 Purple 8412 asked Sep 23 '13 at 17:35 Mia Raunegger 76117 What is your query? –Mihai Sep 23 '13 at 17:36 add a comment| 3 Answers 3 active oldest votes up vote 27 down vote accepted Before you query run SET FOREIGN_KEY_CHECKS=0 then set it to 1 after you`re done. share|improve this answer answered Sep 23 '13 at 17:39 Mihai 15.3k52442 Does it take away all foreign key in the database or in one table. Still not so familiar with SQL. The problem is I can't insert anything in the first table because of the foreign key. –Mia Raunegger Sep 23 '13 at 21:25 3 No it just ignores foreign keys constraints until you enable it again. –Mihai Sep 23 '13 at 21:29 But if you are not sure post the insert query and the table schema.Just write in sql SHOW CREATE TABLE yourTable and post the result. –Mihai Sep 23 '13 at 21:31 Oh, I guess I made a mistake when I created recept. There shouldn't be a foreign key: CREATE TABLE recept ( rec_id int(10) NOT NULL AUTO_INCREMENT, namn varchar(30) DEFAULT NULL, portioner int(5) DEFAULT NULL, beskrivning varchar(3000) DEFAULT NULL, tillagningstid varchar(20) DEFAULT NULL, svarighetsgrad int(2) DEFAULT NULL, P
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about http://stackoverflow.com/questions/16447137/error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up ERROR 1452: Cannot add or update a child row: a foreign key constraint fails foreign key up vote 4 down vote favorite I have created two tables in MySQL 5.6.11 as shown below by means of MySQL Workbench 5.2.47. The country table: delimiter $$ CREATE TABLE `country` ( `id` int(11) NOT NULL AUTO_INCREMENT, `country_name` varchar(45) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INC REMENT=2 DEFAULT CHARSET=utf8$$ The state_table: delimiter $$ CREATE TABLE `state_table` ( `id` int(11) NOT NULL AUTO_INCREMENT, `state_name` varchar(45) DEFAULT NULL, `country_id` int(11) DEFAULT NULL, foreign key constraint PRIMARY KEY (`id`), CONSTRAINT `country_fk` FOREIGN KEY (`id`) REFERENCES `country` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT=''$$ There is one row in the country table with the id 1. It allows only one (child) row to be inserted into its child table state_table. If more rows are attempted, then the following error occurs. ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (social_networking.state_table, CONSTRAINT country_fk FOREIGN KEY (id) REFERENCES country (id) ON DELETE CASCADE ON UPDATE CASCADE) SQL Statement: INSERT INTO `social_networking`.`state_table` (`id`, `state_name`, `country_id`) VALUES ('2', 'xxx', '1') Actually, I'm trying to map these tables using an ORM (JPA) where I always see only OneToOne relationship. What am I missing? mysql mysql-workbench mysql-error-1452 share|improve this question edited Aug 27 '15 at 12:07 asked May 8 '13 at 17:53 Tiny 5,21252189347 add a comment| 5 Answers 5 active oldest votes up vote 7 down vote accepted I think you have a typo in your foreign key constraint, country_id should probaby be the foreign key to country. When id is the foreign key, you can only insert one row since it just happens to get id=1 which is the same id as the row in country; CONSTRAINT `country_fk` FORE