How to use not equal to inside a Yii2 query

Question

I want to use a yii2 query in which I want to check a not equal to condition. I tried like this but it didn\'t give the desired results. How do I do it?

Answer 1

        field($model, 'first_name')->dropDownList(
        arrayhelper::map(user::find()
                                ->where([ 'not in ' ,'first_name', patient::find() ->select([ 'patient_name' ]) ->asArray()  ])
        ->all(),'id','first_name')

Maybe it help you for whom need to use subquery .