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MySQL Cannot add foreign key constraint - mismatched charset


MySQL Cannot add foreign key constraint - mismatched charset

By : Frank R.
Date : November 17 2020, 11:52 AM
To fix the issue you can do I found the answer, the DEFAULT CHARSET clause was mismatched. The second create table statement needs to also declare the DEFAULT CHARSET.
code :
DROP TABLE IF EXISTS `book` ;
DROP TABLE IF EXISTS `person` ;

CREATE TABLE `person` (
  `name` VARCHAR(30) NOT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `book` (
  `author` VARCHAR(30) NOT NULL,
  `title` VARCHAR(100) NOT NULL,
  PRIMARY KEY (`author`, `title`),
  FOREIGN KEY (`author`)
    REFERENCES `person` (`name`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION
) ENGINE = InnoDB DEFAULT CHARSET=latin1;


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Cannot add or update a child row: a foreign key constraint fails(Foreign key issue in mysql)

Cannot add or update a child row: a foreign key constraint fails(Foreign key issue in mysql)


By : Наталья Азаренкова
Date : March 29 2020, 07:55 AM
This might help you I made an SQL Fiddle and everything works perferctly.
The only way I can reproduce the error is when a row is inserted into student before the corresponding row in user exists. Can you please double check that this is really true for each inserted row.
Mysql error: 1215 Cannot add foreign key constraint[ foreign keys same type, innodb ]

Mysql error: 1215 Cannot add foreign key constraint[ foreign keys same type, innodb ]


By : Joy elalam
Date : March 29 2020, 07:55 AM
Does that help As the others stated in comments, your queries are correct
Couple of things you can try :
code :
USE `spring_normalize`;


CREATE TABLE IF NOT EXISTS `users` (
  `username` VARCHAR(60) NOT NULL,
  `password` VARCHAR(80) NULL,
  `authority` VARCHAR(45) NULL,
  `name` VARCHAR(100) NULL,
  `enabled` TINYINT(1) NULL,
  `email` VARCHAR(60) NULL,
PRIMARY KEY (`username`))
ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `offers` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `text` VARCHAR(100) NULL,
  `users_username` VARCHAR(60) NOT NULL,
PRIMARY KEY (`id`, `users_username`),
INDEX `fk_offers_users_idx` (`users_username` ASC),
CONSTRAINT `fk_offers_users`
  FOREIGN KEY (`users_username`)
  REFERENCES `users` (`username`)
  ON DELETE NO ACTION
  ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- Do not check foreign key constraints
SET FOREIGN_KEY_CHECKS = 0;
SHOW ENGINE INNODB STATUS;
SQL constraint to prevent mismatched foreign keys

SQL constraint to prevent mismatched foreign keys


By : Polymorph
Date : March 29 2020, 07:55 AM
I wish did fix the issue. A Foreign Key constraint can easily manage this (which you already have as a tag). All you have to do is slightly change the table definition and the foreign key reference in the PhoneCall table so that it will reference CustomerID in the PhoneNumber table. But in order to do so you'll have to change the table definition of both PhoneNumber and PhoneCall a little because a foreign key needs to be either a primary key or a candidate key(i.e. unique) in the referencing table. So with the provided table definitions, in TSQL recreating those table would look like this (with assumed datatype).
code :
CREATE TABLE PhoneNumber(
    Id INT UNIQUE,
    CustomerId INT UNIQUE REFERENCES Customer(ID),
    AreaCode INT(3),
    Number INT(7),
    CONSTRAINT CK_PhoneID_CustID (ID, CustomerID));

CREATE TABLE PhoneCall (
    CustomerId INT REFERENCES Phonenumber(CustomerID),
    PhoneNumberId  INT REFERENCES PhoneNumber(Id),
    Description NVARCHAR(MAX),
    Duration INT);
LARAVEL:MYSQL : Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails

LARAVEL:MYSQL : Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails


By : VJEF
Date : March 29 2020, 07:55 AM
it should still fix some issue Set the user migration to earlier, before the books table migration happens. Otherwise, there is no user table in existence yet to reference when creating the books table, and thus the error.
This one first:
code :
Schema::create('users', function (Blueprint $table) {...}
MySQL error: Failed to add the foreign key constraint. Missing index for constraint

MySQL error: Failed to add the foreign key constraint. Missing index for constraint


By : user3553140
Date : March 29 2020, 07:55 AM
it helps some times I have searched questions about this problem: , You have to read the documentation carefully:
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