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nydson

Chave Estrangeira No Mysql

Question

Minha tabela esta da seguine forma:

CREATE TABLE tb_categoria (

id_categoria INT(3) NOT NULL AUTO_INCREMENT,

categoria CHAR(10) NOT NULL,

PRIMARY KEY(id_categoria)

);

CREATE TABLE tb_subcategoria (

id_subcategoria INT(3) NOT NULL AUTO_INCREMENT,

id_categoria INT(3) NOT NULL,

subcategoria CHAR(20) NOT NULL,

PRIMARY KEY(id_subcategoria)

);

Ao inserir dados na 'tb_categoria' no campo 'categoria' automaticamente o mysql insere 0 na 'tb_subcategoria' campo 'id_categoria'.

Onde esta o erro?

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