salix/db/routines/vn/procedures/sale_setProblem.sql

DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`sale_setProblem`(
	vProblemCode VARCHAR(25)
)
BEGIN
/**
 * Update column sale.problem with a problem code
 * @param vProblemCode Code to set or unset
 * @table tmp.sale(saleFk, hasProblem, isProblemCalcNeeded)
 */
	UPDATE tmp.sale ts 
			JOIN sale s ON s.id = ts.saleFk
		SET s.problem = NULL
		WHERE NOT ts.isProblemCalcNeeded;

	DELETE FROM tmp.sale WHERE NOT isProblemCalcNeeded;

	UPDATE sale s
			JOIN tmp.sale ts ON ts.saleFk = s.id 
		SET s.problem = CONCAT(
			IF(ts.hasProblem,
				CONCAT(s.problem, ',', vProblemCode),
				REPLACE(s.problem, vProblemCode , '')));
END$$
DELIMITER ;