Yii2 : How to write distinct SQL query?

Question

I want to implement following SQL queries in Yii 2 but with no success.

This should give total number of unique company names:

SELECT count(DISTINCT(company_name)) FROM clients

And this should display company_name with client code and id(PK):

SELECT (DISTINCT(company_name,client_code)) FROM clients

How to achieve this?

Answer 1

Answering my own question I got following working solutions:

Got the count for unique company_name:

$my = (new yii\db\Query())
    ->select(['company_name',])
    ->from('create_client')
    ->distinct()
    ->count();
echo $my;

List of distinct company_name and client_code:

$query = new yii\db\Query();
$data = $query->select(['company_name','client_code'])
    ->from('create_client')
    ->distinct()
    ->all();
if ($data) {
    foreach ($data as $row) {
        echo 'company_name: ' . $row['company_name'] . ' client_code: ' . $row['client_code'] . '<br>';
    }
}