Laravel Eloquent select all rows with max created_at

Question

I have a table that contains:

id  seller_id   amount   created_at
1   10          100      2017-06-01 00:00:00
2   15          250      2017-06-01 00:00:00
.         


        

Answer 1

This worked:

DB::table('snapshot as s')
  ->select('s.*')
  ->leftJoin('snapshot as s1', function ($join) {
        $join->on('s.seller_id', '=', 's1.seller_id');
        $join->on('s.created_at', '<', 's1.created_at');
   })
  ->whereNull('s1.seller_id')
  ->get();

Answer 2

To get latest record for each seller_id you can use following query

select s.*
from snapshot s
left join snapshot s1 on s.seller_id = s1.seller_id
and s.created_at < s1.created_at
where s1.seller_id is null

Using query builder you might rewrite it as

DB::table('snapshot as s')
  ->select('s.*')
  ->leftJoin('snapshot as s1', function ($join) {
        $join->on('s.seller_id', '=', 's1.seller_id')
             ->whereRaw(DB::raw('s.created_at < s1.created_at'));
   })
  ->whereNull('s1.seller_id')
  ->get();