具有多个值的Mysql触发器

Question

如何在一个触发器中对用户名值执行相同操作？

由于

DELIMITER //
  CREATE TRIGGER notnullnameandsurname BEFORE INSERT ON guests FOR EACH ROW
  BEGIN
  IF new.name = "" then
  SIGNAL SQLSTATE '45000';
  END IF;
  END //

Answer 1

如何使用or？

DELIMITER //
  CREATE TRIGGER notnullnameandsurname BEFORE INSERT ON guests FOR EACH ROW
  BEGIN
  IF new.name = '' or new.username = '' then
  SIGNAL SQLSTATE '45000';
  END IF;
  END //