Eloquent Abfrage auf 2 Tabellen

Question

Im den folgenden Fehler erhalten:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'value' in 'where clause' (SQL: select sum(gross) as value, first_name from clients left join transactions on clients . id = transactions . client_id where value > 0 group by first_name)

Aus dieser Funktion?

$data = DB::table('clients')->leftjoin('transactions','clients.id','=','transactions.client_id') 
     ->select(DB::raw('sum(gross) as value, first_name')) 
     ->where('value','>',0) 
     ->groupBy('first_name') 
     ->get(); 

return $data; 

Answer 1

SQL is evaluated backwards, from right to left. So the where clause is parsed and evaluate prior to the select clause. Because of this the aliasing of sum(gross) to value has not yet occurred.

Aliases can be used in GROUP BY, ORDER BY, or HAVING clauses.

So anstelle von value in denen sum(gross) verwenden Sie bitte, wo wie unten.

$data = DB::table('clients')->leftjoin('transactions','clients.id','=','transactions.client_id') 
     ->select(DB::raw('sum(gross) as value, first_name')) 
     ->where('sum(gross)','>',0) 
     ->groupBy('first_name') 
     ->get(); 

return $data;