Error No 1452 Mysql

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Mysql Error 1452 Foreign Key Constraint Fails

Join them; it only takes a minute: Sign up Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails up vote 179 down vote favorite 53 I'm having a bit of a strange problem, I'm trying to add a foreign key to one table that references another, but it is failing for some mysql error 1452 23000 reason. With my limited knowledge of MySQL, the only thing that could possibly be suspect is that there is a foreign key on a different table referencing the one I am trying to reference. Here is a picture of my table relationships, generated via phpMyAdmin: Relationships I've done a SHOW CREATE TABLE query on both tables, sourcecodes_tags is the table with the foreign key, sourcecodes is the referenced table. CREATE TABLE `sourcecodes` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `user_id` int(11) unsigned NOT NULL, `language_id` int(11) unsigned NOT NULL, `category_id` int(11) unsigned NOT NULL, `title` varchar(40) CHARACTER SET utf8 NOT NULL, `description` text CHARACTER SET utf8 NOT NULL, `views` int(11) unsigned NOT NULL, `downloads` int(11) unsigned NOT NULL, `time_posted` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY `user_id` (`user_id`), KEY `language_id` (`language_id`), KEY `category_id` (`category_id`), CONSTRAINT `sourcecodes_ibfk_3` FOREIGN KEY (`language_id`) REFERENCES `languages` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `sourcecodes_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `sourcecodes_ibfk_2` FOREIGN KEY (`category_id`) REFERENCES `c

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A Foreign Key Constraint Fails Mysql Insert

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Cannot Add Or Update A Child Row A Foreign Key Constraint Fails On Delete Cascade On Update Cascade)

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 http://stackoverflow.com/questions/1253459/mysql-error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fa add or update a child 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 http://stackoverflow.com/questions/21659691/error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails Produkt( ProduktID int NOT NULL, ProduktBeskrivelse varchar(100) DEFAULT 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

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 Stack Overflow the http://stackoverflow.com/questions/22210461/mysql-error-code-1452-foreign-key-constraint company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions http://stackoverflow.com/questions/5198600/mysql-foreign-key-error-1452 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 MySQL Error Code 1452 Foreign Key Constraint up vote 2 down vote favorite I'm receiving an error when I attempt to 1452 mysql create two tables. There was a multivalued dependency, so I separated the tables and came up with this: CREATE TABLE NAME ( NameID Integer NOT NULL AUTO_INCREMENT, Name varChar(255) NOT NULL, CONSTRAINT NAME_PK PRIMARY KEY(NameID) ); CREATE TABLE PHONE ( NameID Integer NOT NULL, PhoneNumber varChar(15) NOT NULL, NumType varChar(5) NOT NULL, CONSTRAINT PHONE_FK FOREIGN KEY(NameID) REFERENCES NAME(NameID), CONSTRAINT PHONE_PK PRIMARY KEY(NameID) ); But when attempting to add values with this code: INSERT mysql error 1452 INTO NAME (NameID, Name) VALUES (default, 'John Doe'); INSERT INTO PHONE (NameID, PhoneNumber, NumType) VALUES (default, '706-782-4719', 'Home'); I receive the infamous 1452 error: Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails (`phone_mcneill`.`PHONE`, CONSTRAINT `PHONE_FK` FOREIGN KEY (`NameID`) REFERENCES `NAME` (`NameID`)) I am not entirely sure what this means as I have NameID autoincrementing in the first table. I can't have it auto_increment in the second one as well as it's a foreign key, correct? Thanks in advance for the help. mysql sql database foreign-keys mysql-error-1452 share|improve this question asked Mar 5 '14 at 22:10 Archibald 272215 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted You have defined a foreign key constraint on NameID column i.e in table PHONE using insert for phone table you have passed default against NameID ,but NameID is pointing to NAME table and expecting to have the inserted record id from NAME table it doesn't have a default value as per the docs When a new AUTO_INCREMENT value has been generated, you can also obtain it by executing a SELECT LAST_INSERT_ID() So your second insert can use the inserted if from NAME table like INSERT INTO NAME (NameID, NAME) VALUES (DEFAULT, 'John Doe'); INSERT INTO PHONE (NameID, PhoneNumber, NumType) VALUES

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 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 mysql foreign key error #1452 up vote 3 down vote favorite 1 ALTER TABLE `groups` ADD FOREIGN KEY ( `company_id` ) REFERENCES `summaries`.`companies` ( `id` ) ON DELETE CASCADE ; MySQL said: #1452 - Cannot add or update a child row: a foreign key constraint fails (`summaries/#sql-164a_33c`, CONSTRAINT `#sql-164a_33c_ibfk_1` FOREIGN KEY (`company_id`) REFERENCES `companies` (`id`) ON DELETE CASCADE) companies.id is primary auto increment int(11) company_id is index int(11) I don't understand the error message. Can anyone shed some light on this? mysql share|improve this question asked Mar 4 '11 at 19:58 Webnet 23.4k65201345 Paste outputs of both create table groups and summaries.companies ? –Zimbabao Mar 4 '11 at 20:00 add a comment| 4 Answers 4 active oldest votes up vote 23 down vote accepted That means you have at least one row in the child table that references a non-existent row in the parent table. If you are absolutely sure that you are okay with having a data integrity issue like that, you can add the foreign key by disabling foreign key checks before you run the ALTER TABLE command: SET FOREIGN_KEY_CHECKS = 0; share|improve this answer answered Mar 4 '11 at 20:10 Ike Walker 33.5k95278 add a comment| up vote 2 down vote I just had this problem, although in a somewhat more specific scenario. In my c