Yii createCommand（）以不同的数组格式返回数据集

Question

I'm a beginner in this framework. Though I have gone over the basics, there is one thing which is troubling me. As of now, I'm using

$group_sql = "SELECT uid FROM {$table}";
$group_users = Yii::app()->db->createCommand($group_sql)->queryAll();
print_r($group_users);

results in

Array
(
    [0] => Array
        (
            [uid] => 2
        )

    [1] => Array
        (
            [uid] => 3
        )

    [2] => Array
        (
            [uid] => 4
        )

    [3] => Array
        (
            [uid] => 5
        )

)

But I'd like to change the format in which the data is returned. What I'm looking for is something like

Array
(
    [0] => 2
    [1] => 3
    [2] => 4
    [3] => 5
)

OR

Array
(
    [uid] => Array
        (
            [0] => 2
            [1] => 3
            [2] => 4
            [3] => 5
        )
)

I'm aware that I can go through the documentation and get my answer, but due to time constraints, I'm taking the liberty to shamelessly ask this over here.

Thanks in advance.

Answer 1

Use queryColumn() method instead of queryAll()