Left join to get a single row in Laravel
I have used DB::raw()
in order to achieve this
$album = Albums::select( 'albums.*',
DB::raw('(select photo from photos where albums_id = albums.id and status = 1 order by id asc limit 1) as photo') )
->where('users_id',$user_id)
->where('albums.status',1)->get();
@JarekTkaczyk 's coding was similar and displayed the same result as I needed, so a special thanks to him for his time and effort...
But comparing the execution time for the quires
I stayed to mine as my above snippet
select `albums`.*, (select photo from photos where albums_id = albums.id and status = 1 order by id asc limit 1) as photo from `albums` where `users_id` = '1' and `albums`.`status` = '1'
took 520μs - 580μs
and @JarekTkaczyk 's
select `albums`.*, `p`.`photo` from `albums` left join `photos` as `p` on `p`.`albums_id` = `albums`.`id` and `p`.`created_at` = (select min(created_at) from photos where albums_id = p.albums_id) and `p`.`status` = '1' where `users_id` = '1' and `albums`.`status` = '1' group by `albums`.`id`
took 640μs - 750μs
But both did the same...
You can achieve it using either leftJoin
or rightJoin
(but the latter would return Photo
models, so probably you won't need that):
Albums::where('users_id', $user_id)
->leftJoin('photos as p', function ($q) {
$q->on('photos.albums_id', '=', 'albums.id')
->on('photos.updated_at', '=',
DB::raw('(select min(updated_at) from photos where albums_id = p.albums_id)'))
->where('photos.status', '=', 1);
})
->where('albums.status', 1)
->groupBy('albums.id')
->select('albums.*', fields from photos table that you need )
->get();