mysql 按照兩個字段之和進行排序

SELECT *,zan_num+fake_zan_num show_zan FROM `tf_news` order by show_zan desc

TP實現

$news = M('news');
$result_list = $news->where($where)->limit($start . ',' . $step)->field('*,zan_num+fake_zan_num show_num')->order($order)->select();