Mysql Foreign Key Constraint Error 1452
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Mysql Error 1452 Foreign Key Constraint Fails
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Error Code 1452 Mysql Workbench
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A Foreign Key Constraint Fails Mysql Insert
only takes a minute: Sign up ERROR 1452: Cannot add or update a child row: a foreign key constraint fails up vote 31 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 cannot add or update a child row a foreign key constraint fails on delete cascade on update cascade) Ordre_fk foreign key(KundeID) references Kunde(KundeID) ) engine = InnoDB; PRODUKT table: Create table 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 15.3k52542 asked Feb 9 '14 at 13:37 user3289677 156123 1 possible duplicate of Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fai
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 mysql replication error 1452 about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users cannot add or update a child row a foreign key constraint fails entity framework Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each set foreign_key_checks=0 mysql 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 down vote favorite 4 I'm getting this error: 1452 - Cannot http://stackoverflow.com/questions/21659691/error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails 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 '13 at 17:52 Purple 8412 asked Sep 23 '13 at 17:35 Mia Raunegger 76117 What http://stackoverflow.com/questions/18965424/1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails 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 15.3k52542 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, PRIMARY KEY (rec_id), CONSTRAINT recept_ibfk_1 FOREIGN KEY (rec_id) REFERENCES tillhör (rec_id) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=latin1 How do I get rid of that. Tried but it want work. –Mia Raunegger Sep 23 '13 at 2
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 http://stackoverflow.com/questions/5198600/mysql-foreign-key-error-1452 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 https://www.experts-exchange.com/questions/28238845/1452-Cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails.html Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up mysql foreign key error #1452 up vote foreign key 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 foreign key constraint message. Can anyone shed some light on this? mysql share|improve this question asked Mar 4 '11 at 19:58 Webnet 23.5k65202345 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 33.6k95278 add a comment| up vote 2 down vote I just had this problem, although in a somewhat more specific scenario. In my case, I had added, to an existing table, a column that I needed to be both nullable and act as a foreign key (i.e., for non-null entries to be bound by a foreign key constraint). The referenced column looked like this: +-------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key |
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