Laravel - SQLSTATE[42000] - UNION - sql

Question

I am making a UNION between these two queries:
$first =
DB::table('pedido')
->select(DB::raw('date(fecha_pago) as fecha'),DB::raw('sum(subtotal) as ingreso'),DB::raw('0 as egreso'))
->where('idestado','=','2')
->groupBy(DB::raw('date(fecha_pago)'));
$second =
DB::table('egreso')
->select(DB::raw('date(fecha) as fecha'),DB::raw('0 as ingreso'),DB::raw('sum(monto) as egreso'))
->groupBy(DB::raw('date(fecha)'));
$final_query=
DB::select(DB::raw('date(fecha),sum(ingreso) as ingreso,sum(egreso) as egreso'))
->union($first)->union($second)
->groupBy(DB::raw('date(fecha)'))
->get();
I get the error:
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'date(fecha),sum(ingreso) as ingreso,sum(egreso) as egreso' at line 1 (SQL: date(fecha),sum(ingreso) as ingreso,sum(egreso) as egreso)

Answer 1

DB::select() executes a raw query, unlike DB::table()->select() which is used to define fields for the query builder to select.
You're missing the DB::table() in your final query, without it, you won't be using the query builder and you'll actually be running a query of just date(fecha),sum(ingreso) as ingreso,sum(egreso) as egreso.
https://laravel.com/docs/5.6/queries#selects