在创建时，是否可以将2列(开始日、结束日)的天数差存储到同一表中的新列中？

CREATE TABLE mytable (
  id INT PRIMARY KEY,
  start_date DATE,
  end_date DATE,
  date_diff INT AS (DATEDIFF(end_date, start_date))
);

CREATE TABLE mytable (
  id INT PRIMARY KEY,
  start_date DATE,
  end_date DATE,
  date_diff INT
);

CREATE TRIGGER calculate_date_diff
ON mytable
AFTER INSERT, UPDATE
AS
BEGIN
  UPDATE mytable
  SET date_diff = DATEDIFF(day, inserted.start_date, inserted.end_date)
  FROM inserted
  WHERE mytable.id = inserted.id;
END;