MySQL - 计算行之间的差异

Question

所以我正在使用MySQL和PHP。尝试获取计算连续行之间差异的查询时遇到一些麻烦。

我需要的是获得每行之间的差异：data_views，data_sub＆amp;每个频道网址data_videos。

非常感谢，如果有人可以提供帮助：）

这是我的桌面结构：

Answer 1

试试这个..如果您不想订购，只需删除ORDER BY A.channel_url子句..

SELECT 
  A.*,
  A.data_views - IFNULL(B.data_views, A.data_views) AS data_views_diff,
  A.data_subs - IFNULL(B.data_subs, A.data_subs) AS data_subs_diff,
  A.data_videos - IFNULL(B.data_videos, A.data_videos) AS data_videos_diff 
FROM
  my_table A 
  LEFT JOIN my_table B 
    ON B.id = 
    (SELECT 
      MIN(id) 
    FROM
      my_table C 
    WHERE C.id > A.id 
      AND C.id != A.id 
      AND C.channel_url = A.channel_url) 
ORDER BY A.channel_url;

检查Fiddle