更新时间:2023-01-31 07:59:17
试试下面的语法
CREATE TRIGGER mytabletriggerexample
BEFORE INSERT
FOR EACH ROW BEGIN
IF(NEW.important_value) < (fancy * dancy * calculation) THEN
DECLARE dummy INT;
SELECT Your meaningful error message goes here INTO dummy
FROM mytable
WHERE mytable.id=new.id
END IF; END;