Question

在我的项目中，我有两种类型的视频：免费视频和精选视频。我正在 channel_videos 的表格中保存免费视频的详细信息，如下所示：

id  videotitle    video     thumbnail  added_on

我正在视频表中保存精选视频的详细信息。

videoid    title    videolink    videothumbnail  added_on

当用户观看视频时，观看的视频详细信息以及查看的用户详细信息将存储在另一个表 Viewedmovies 中。

id   user_id   movie_id   videotype    watched_on

在此表中，如果字段 videotype 的值为0（免费视频），则查询表 channel_videos ，如果 videotype 是1（精选视频）然后查询表视频。

select viewedmovies.id,viewedmovies.watched_on,video.title,video.videothumbnail,video.views,
video.likes,video.length,video.videoid from viewedmovies INNER JOIN video ON viewedmovies.movie_id=video.videoid
and viewedmovies.user_id=1 group by viewedmovies.user_id,viewedmovies.movie_id,viewedmovies.videotype order by watched_on desc LIMIT 6

以上是我使用过的查询。但这仅从视频表中获取结果。

如何在单个查询中执行此操作？另外，我希望将结果分组到 seenmovies 表的movie_id，videotype和user_id字段中。

提前致谢。

Answer 1

我没有测试过，但是这样的事情应该有效：

SELECT viewedmovies.id, viewedmovies.watched_on
, video.title, video.videothumbnail, video.views, video.likes, video.length, video.videoid
, channel_videos.videotitle, channel_videos.thumbnail, channel_videos.id
 FROM viewedmovies
 LEFT JOIN video
 ON (viewedmovies.movie_id=video.videoid AND viewedmovies.user_id=1 AND viewedmovies.videotype=1)
 LEFT JOIN channel_videos
 ON (viewedmovies.movie_id=channel_videos.id AND viewedmovies.user_id=1 AND viewedmovies.videotype=0)
 GROUP BY viewedmovies.user_id, viewedmovies.movie_id, viewedmovies.videotype
 ORDER BY watched_on desc
 LIMIT 6

根据字段的值获取不同表中的值

1 个答案: