'mysql' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

    'mysql_earth' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_EARTH_DATABASE', 'earth'),
        'username' => env('DB_EARTH_USERNAME', 'earth'),
        'password' => env('DB_EARTH_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

  'mysql_moon' => [
    'driver' => 'mysql',
    'host' => env('DB_HOST', '127.0.0.1'),
    'port' => env('DB_PORT', '3306'),
    'database' => env('DB_MOON_DATABASE', 'moon'),
    'username' => env('DB_MOON_USERNAME', 'moon'),
    'password' => env('DB_MOON_PASSWORD', ''),
    'unix_socket' => env('DB_SOCKET', ''),
    'charset' => 'utf8mb4',
    'collation' => 'utf8mb4_unicode_ci',
    'prefix' => '',
    'strict' => true,
    'engine' => null,
],

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=forge
DB_USERNAME=forge
DB_PASSWORD=forgepw

DB_EARTH_DATABASE=earth
DB_EARTH_USERNAME=erth
DB_EARTH_PASSWORD=earthpw

DB_MOON_DATABASE=moon
DB_MOON_USERNAME=moon
DB_MOON_PASSWORD=moonpw

$db = DB::connection('mysql');
$db = DB::connection('mysql_earth');
$db = DB::connection('mysql_moon');

        $products = $db->table('products')
            ->distinct()
            ->select("*" )
            ->orderBy('products.id','asc')
            ->get();