Supposons qu'une table ELEMENT et une table CATEGORIE sont composées comme suit :
CREATE TABLE `ma_base`.`CATEGORIE` (
`id_categorie` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
`nom_categorie` VARCHAR(45) NOT NULL,
PRIMARY KEY (`id_categorie`)
)
ENGINE = InnoDB;
CREATE TABLE `ma_base`.`ELEMENT` (
`id_element` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
`nom_element` VARCHAR(45) NOT NULL,
`id_categorie` INTEGER UNSIGNED NOT NULL,
PRIMARY KEY (`id_element`),
CONSTRAINT `FK_ELT_CAT` FOREIGN KEY `FK_ELT_CAT` (`id_categorie`)
REFERENCES `categorie` (`id_categorie`)
ON DELETE CASCADE
ON UPDATE CASCADE
)
ENGINE = InnoDB;
Voir la suite
