将两个不相关查询的结果合并到单个视图中

Question

是否可以将两个单独的（不相关的）SQL查询的结果合并到一个视图中。我正在尝试汇总一些用户数据并计算本月视频的观看次数，以显示在仪表板上。

IE，

select count(*) from video where monthname(views) = 'May';

和

select sum(sessions) from user where user_id = 6;

我想创建一个包含这两个结果的视图。

这可能吗？

Answer 1

SELECT t2.total_session,
       t1.watch_count
FROM
  (SELECT 1 AS common_key,
          count(*) AS watch_count
   FROM video
   WHERE monthname(views) = 'May') AS t1
JOIN
  (SELECT 1 AS common_key,
               sum(sessions) AS total_session
   FROM USER
   WHERE user_id = 6) AS t2 ON t1.common_key = t2.common_key;

当然，仅当t1和t2中的输出均为一行时，这才是非常有效的。