如何在laravel中編寫內部查詢或嵌套查詢

Question

我想在以下查詢中的'select'（內部查詢）中寫'select'。內部查詢將用於如下計數： select count（'id'）from order where memb_id = 2;

和查詢是：

$payment_pending_report = DB::connection('mysql_freesubs')->table('contact as c') 
             ->select("a.name","c.lname","a.amount as pending amount")    
             ->join("member AS m", "c.id", "=", "m.cont_id") 
             ->join("order AS o", "o.memb_id", "=", "m.id") 
             ->join("account AS a", "c.id", "=", "a.cont_id") 
             ->where("a.amount_type", "=","dr") 
             ->get(); 

Answer 1

事情是這樣的：

$payment_pending_report = DB::connection('mysql_freesubs')->table('contact as c') 
            ->select("a.name","c.lname","a.amount as pending amount", "oc.OrderCount as order_count")    
            ->join("member AS m", "c.id", "=", "m.cont_id") 
            ->join("order AS o", "o.memb_id", "=", "m.id") 
            ->join("account AS a", "c.id", "=", "a.cont_id") 
            ->join(DB::raw("(SELECT m.id, COUNT(o.some_unique_id) as OrderCount FROM member as m INNER JOIN order as o ON o.memb_id = m.id GROUP BY m.id) AS oc"), function($join) 
            { 
             $join->on('m.id', '=', 'oc.id'); 
            }) 
            ->join("(") 
            ->where("a.amount_type", "=","dr") 
            ->get();