Question

I have been looking into many posts here and other places but I still can’t make it work.

I’m trying to create the following 2 tables on xampp. But I’m having problems in the second with the foreign key, even after added the InnoDB.

Can anyone take a look at the following code and tell me what am i doing wrong in the foreign key part so that xampp doesn’t accept the table? Thank you!

CREATE TABLE fichas (
    id_ficha INT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE,
    cod_produto VARCHAR(20) NULL,
    nome_produto VARCHAR(50),
    versao INT,
    data_ficha DATE,
    PRIMARY KEY (id_ficha)
) ENGINE=INNODB;

CREATE TABLE ident_dangers (
    id_fichas INT NOT NULL,
    class_subst TEXT NULL,
    simb_perigo VARCHAR(50) NULL,
    words_r VARCHAR (200) NULL,
    INDEX (id_fichas),
    FOREIGN KEY (id_fichas) REFERENCES fichas(id_ficha),
) ENGINE = InnoDB;

Answer 1

I have faced similar error. Usually it comes from having different types on your fields.

Your table fichas has:

id_ficha INT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE

To match it your field id_dichas on the ident_dangers tables should be declared:

id_fichas INT UNSIGNED NOT NULL,