用于递增I.T部门员工薪资的PL-SQL游标。在MySql中降低20%

DELIMITER //

CREATE PROCEDURE DecreaseSalaryBy20()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE emp_id INT;
    DECLARE emp_salary DECIMAL(10, 2);
    DECLARE cur CURSOR FOR SELECT id, salary FROM employees;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO emp_id, emp_salary;
        IF done THEN
            LEAVE read_loop;
        END IF;
        UPDATE employees SET salary = salary * 0.8 WHERE id = emp_id;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;

CALL DecreaseSalaryBy20();