使用yii2中的sum（）和相关字段的组合

Question

我有一张桌子帐单，其中有3列 - partyname，billdate，billamount。还有另外一个表格会有专栏名称和分区。两者都与派对相关。我可以加入它们并在gridview中显示数据。我想是显示所有各方的数据如下

District Billdate Billamount 
Kolkata 2016-03-02 20000 
Malda 2016-03-02 30000 
Jalpaiguri 2016-03-02 30000 

的Billamount列的总和（金额）属于特定的地区。我读过Yii2 - getting sum of a column,Yii 2 ActiveDataProvider query with ->all() gives "Call to a member function andFilterWhere() on array" error,Yii2 Query does not return column sum,Yii2 - getting sum of a column。但无法实现。请帮忙。 我的搜索是

public function search($params) 
    { 
     $query = Bills::find(); 
     $query->joinWith(['parties']); 

     //$command = Yii::$app->db->createCommand("SELECT sum(billamount) FROM bills"); 
     //$sum = $command->queryScalar(); 
     //echo $sum; 
     //$sum = $query->sum('billamount'); 
     //echo $sum; 
     // $sum = (new \yii\db\Query())->from('bills'); 
     // $sum = $sum->sum('billamount'); 
     // echo $sum; 

     //$sum = $query->sum('billamount'); 
     //echo $sum; 

     // add conditions that should always apply here 

     $dataProvider = new ActiveDataProvider([ 
      'query' => $query, 
     ]); 

Answer 1

扩展您的总和别名变种

class YuorModel extends \yii\db\ActiveRecord 
{ 

    public $my_sum; 
    ..... 

然后

$query = Bills::find()->select('partyname, billdate, sum(billamount) as my_sum)'; 
$query->joinWith(['parties']); 

在你的数据提供程序，你可以参考的总和与 'my__sum'

模型