How to concatenate columns with Laravel 4 Eloquent?

lists() method used to select column from selected result. So first contact first name and last name and give this column with new alias name in select statement

 $tenants = Tenant::orderBy('First_Name')->select(DB::row('CONCAT(`First_Name`," ",`Last_Name`) as name'),'Tenant_Id')->lists('name', 'id');

then you can select this alias in lists() method

You should use the DB::raw() to concat those of field

Tenant::select(
          'Tenant_Id',
          DB::raw('CONCAT(First_Name,"-",Last_Name) as full_name')

        )
       ->orderBy('First_Name')
       ->lists('full_name', 'Tenant_Id');

Tenant::select('Tenant_Id', DB::raw('CONCAT(First_Name, " ", Last_Name) AS full_name'))
    ->orderBy('First_Name')
    ->lists('full_name', 'Tenant_Id');

An easy way is to use selectRaw. It was implemented by Tailor in Jan 30, 2014

Source

Tenant::selectRaw('CONCAT(First_Name, " ", Last_Name) as TenantFullName, id')->orderBy('First_Name')->lists('TenantFullName', 'id'))