how to combine 2 column data in where clause laravel code example

Example 1: 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();

Example 2: 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();

Example 3: how to join two table in laravel

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