Is it possible to reference one column as multiple

Question

I have few tables, and I want to reference one column from PDF table to multiple other tables.

for example if PDF table select output looks like this:

ITEM_TYPE  ITEM_ID  QUANTITY

1          23       3
2          12       1

it tells me:

PDF have 3 Car Wheel Product, and 1 Car Template Header above;

I wrote SQL code, but does not work properly:

CREATE TABLE `pdf_created` (
    `id` INT(10) UNSIGNED NOT NULL UNIQUE AUTO_INCREMENT,
    `pdf_id` INT(10) NOT NULL,
    `item_type` INT(3) UNSIGNED NOT NULL,
    `item_id` INT(10) UNSIGNED NOT NULL,
    `quantity` INT(3) NOT NULL,
    PRIMARY KEY (`id`),
    KEY `FK_pdf_id` (`pdf_id`),
    CONSTRAINT `FK_pdf_id` FOREIGN KEY (`pdf_id`) REFERENCES `pdf` (`id`),
    KEY `FK_item_type` (`item_type`),
    CONSTRAINT `FK_item_type` FOREIGN KEY (`item_type`) REFERENCES `item` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
    KEY `FK_item_id` (`item_id`),
    CONSTRAINT `FK_item_id` FOREIGN KEY (`item_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
    CONSTRAINT `FK_item_id` FOREIGN KEY (`item_id`) REFERENCES `service` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
    CONSTRAINT `FK_item_id` FOREIGN KEY (`item_id`) REFERENCES `header` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `header` (
    `id` INT(10) UNSIGNED NOT NULL UNIQUE AUTO_INCREMENT,
    `title` VARCHAR(255),
    `desc` VARCHAR(65535),
    PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `service` (
    `id` INT(10) UNSIGNED NOT NULL UNIQUE AUTO_INCREMENT,
    `desc` VARCHAR(65535) NOT NULL,
    `price` DECIMAL(5,2) NOT NULL,
    `active` INT(1) NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `product` (
    `id` INT(10) UNSIGNED NOT NULL UNIQUE AUTO_INCREMENT,
    `category_id` INT(3) UNSIGNED NOT NULL,
    `symbol` VARCHAR(255),
    `desc` VARCHAR(65535), 
    `price` DECIMAL(5,2) NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

it is possible to create it?

Answer 1

ya its possible foreign key constraint name should be different like this and primary key and foreign key table column should have same data type like this..

CREATE TABLE `neo_address_t` (
  `address_id` varchar(8) NOT NULL,
  `address_line_1` varchar(45) NOT NULL,
  `address_line_2` varchar(45) NOT NULL,
  `address_line_3` varchar(45) NOT NULL,
  `address_city` varchar(45) NOT NULL,
  `address_zipcode` varchar(45) NOT NULL,
  `address_state` varchar(45) NOT NULL DEFAULT 'Karnataka',
  `address_country` varchar(45) NOT NULL DEFAULT 'INDIA',
  `created_by` varchar(8) DEFAULT NULL,
  `created_on` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `last_modified_by` varchar(8) DEFAULT NULL,
  `last_modified_date` timestamp NULL DEFAULT '0000-00-00 00:00:00',
  `Refer_ID` int(11) DEFAULT NULL,
  `a_id` varchar(255) DEFAULT NULL,
  `referenceid` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`address_id`),
  KEY `hospital_ID_FK_idx` (`Refer_ID`),
  CONSTRAINT `Patient_ID_FK` FOREIGN KEY (`Refer_ID`) REFERENCES `neo_patient_t` (`patient_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `hospital_ID_FK` FOREIGN KEY (`Refer_ID`) REFERENCES `neo_hospital_t` (`hospital_id`) ON DELETE NO ACTION ON UPDATE CASCADE,
  CONSTRAINT `staff_ID_FK` FOREIGN KEY (`Refer_ID`) REFERENCES `neo_staff_t` (`staff_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION
)     
ENGINE=InnoDB DEFAULT CHARSET=utf8$$