如何将空值更改为零

Question

空列的值returns null。如何将空值变为零，以便如果值为空，则 returns 为零。

 public function getThumbsUpAttribute($value){
     return $value !== null ? $value : 0;
}


public function videos()
{


        // return VideoViewsLikes::all();
       $rec_videos = Videos::orderBy('videos.created_at', 'DESC')->where('videos.publish', 1)
            ->leftJoin('video_views_likes', 'videos.vid_id', '=', 'video_views_likes.vid_id')
            ->select('videos.vid_id', 'videos.title as title', DB::raw("sum(video_views_likes.thumbs_down)  as dislike"), DB::raw("sum(video_views_likes.views)  as views"), DB::raw("sum(video_views_likes.thumbs_up)  as likes"))
            ->groupby('videos.vid_id')
            ->groupby('videos.title')
                ->get();
      
         return response()->json(['success' => $rec_videos]);
}

它仍然 returns 无效。

Answer 1

而不是：

 DB::raw("sum(video_views_likes.thumbs_down)  as dislike");

您可以使用 COALESCE Return 第一个 non-null 值

 DB::raw(" COALESCE(sum(video_views_likes.thumbs_down),0)  as dislike");

如何将空值更改为零

how to change null value to zero

php

null

join

left-join

laravel