DROP TRIGGER IF EXISTS `vn2008`.`ArticlesBeforeInsert`;

DELIMITER $$
USE `vn2008`$$
CREATE DEFINER=`root`@`%` TRIGGER `vn2008`.`ArticlesBeforeInsert`
	BEFORE INSERT ON `Articles` FOR EACH ROW
BEGIN
	DECLARE vDensity DOUBLE;
	DECLARE vInsertId INT;

	IF NEW.density IS NULL
	THEN
		SELECT density INTO vDensity
			FROM Tipos WHERE tipo_id = NEW.tipo_id;

		SET NEW.density = vDensity;
	END IF;


END$$
DELIMITER ;