$field = ["FROM_UNIXTIME(addtime,'%Y-%m-%d')" => "days",
"SUM(price)"=>"pr",
"SUM(trueprice)"=>"tpr"
];
$ex = $model->where("addtime","between",[$stime,$endtime])
->where("status",">",1)
->field($field)
->group("days")
->paginate(10,false);
这个paginate无论如何都会返回错误，不能按自定义的days，groupby