--产品表create table product(product_id , constraint PK_product primary key(product_id), user_id) ;--步骤表create table procedure( procedure_id, product_id, constraint FK_proce_product_id foreign key references to product(product_id), constraint PK_proce_proce_id primary key(procedure_id));--信息表create table pro_message(message_id , procedure_id, constraint FK_pro_message_pro_id foreign key references to procedure(procedure_id), constraint PK_pro_message_mess_id primary key(message_id));