使用查询生成器使用子选择连接表

Question

Is it possible to JOIN a subselect with another table in Laravel 5 Query Builder?

I mean - theoretically - something like this:

$sub = DB::table('A')->select(DB::Raw('id, MAX(date)'))->groupBy('id')->get();

$query = DB::table('B')->join($sub, 'B.id', '=', $sub->id)->get();

In my case, in table A I have duplicated rows. I need the ones with max date per id . Then I need to join the result with table B .

Answer 1

As adviced in comments, a workaround follows.

$idArray= DB::table('A')->select(DB::Raw('id, MAX(date)'))->groupBy('id')->lists('id');

$query = DB::table('B')->whereIn('id', $idArray)->get();

But, again, just a workaround.