plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSQLServer%2B%E3%83%86%E3%83%BC%E3%83%96%E3%83%AB%E3%81%AE%E3%82%B9%E3%82%AD%E3%83%BC%E3%83%9E%E6%83%85%E5%A0%B1%E3%82%92%E5%8F%96%E5%BE%97
plugin=diff is not implemented.