DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `vn`.`supplier_getGeo`(vSelf INT)
	RETURNS int(11)
	DETERMINISTIC
BEGIN
/**
 * Returns the geo for the passed supplier.
 *
 * @param vSelf The address id
 * @return The geo id
 */
 	DECLARE vGeoFk INT;

	SELECT p.geoFk INTO vGeoFk
		FROM supplier s
			JOIN town t ON t.provinceFk = s.provinceFk
			JOIN postCode p ON p.townFk = t.id
				AND (p.code = s.postCode OR s.postCode IS NULL)
			LEFT JOIN supplierAddress sad ON sad.supplierFk = s.id
			JOIN zoneGeo zg ON zg.id = p.geoFk
		WHERE s.id = vSelf
		ORDER BY (s.city SOUNDS LIKE t.name) DESC,
			(p.code = s.postCode) DESC,
			(p.code = sad.postalCode) DESC
		LIMIT 1;

	RETURN vGeoFk;
END$$
DELIMITER ;