插入语法为
INSERT INTO table (columns_list) VALUES (values_list)
因此您的插入内容应如下所示（我不是MysqL专家，但您可以适合查询）：
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, 'field1', OLD.field, NEW.field, CURRENT_DATETIME());
并重复它以对field2和field3进行修改
我认为这将是完整的触发器，请尝试：
DELIMITER $$
DROP TRIGGER `update_data `$$
CREATE TRIGGER `update_data` AFTER UPDATE on `data_table`
FOR EACH ROW
BEGIN
IF (NEW.field1 != OLD.field1) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field1", OLD.field1, NEW.field1, Now());
END IF;
IF (NEW.field2 != OLD.field2) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field2", OLD.field2, NEW.field2, Now());
END IF;
IF (NEW.field3 != OLD.field3) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field3", OLD.field3, NEW.field3, Now());
END IF;
END$$
DELIMITER ;
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