Answers for "how to combine 2 column data in where clause laravel"

join 2 tables laravel

use Illuminate\Support\Facades\DB;

$users = DB::table('users')
            ->join('contacts', 'users.id', '=', 'contacts.user_id')
            ->join('orders', 'users.id', '=', 'orders.user_id')
            ->select('users.*', 'contacts.phone', 'orders.price')
            ->get();

comparison of two tables in laravel using model

$paidFeesIds = Fee::whereHas('paidFees', function($q) {
    $q->where('payment_status', 1);
})->pluck('id')->toArray();

$notPaidFeesIds = Fee::whereNotIn('id', $paidFeesIds)->pluck('id')->toArray();