We are always wanted to use sql query for concatenate fullname or something to concat using mysql concat function, now if you think how to use concat function in laravel query builder then this post can help you. So, if you need to use concat mysql function then see bellow example:
<pre class="prettyprint lang-php">
$user = User::select("users.*"
,DB::raw("CONCAT(users.first_name,' ',users.last_name) as full_name"))