根据参数WordPress获取结果

I'm attempting to customize a wordpress theme. I've added custom field cp_job with form submission. This indicates if the ad is either Buyer(Buying services) or Seller(selling services), which is now complete.

Now I want to fetch results based on buyer or seller. In this wordpress theme classipress they have "Ads" on the side:

I simply want to fetch ads which have the attribute buyer or seller, which I assume is under the MySQL column cp_job. These ads will return the ad with all columns. Doing this in native PHP and MySQL would be easy but working around this theme/wordpress is way more complicated as I don't understand WordPress syntax.

You can use wordpress custom query to fetch record from any table.Like

global $wpdb;
// return array of object
$dataArr = $wpdb->get_results(" SELECT col FROM table WHERE cond = data ");

Then you can do foreach on records like below:

foreach( $dataArr as $data ){
    echo $data->col;
}

Hope this helps ;) Cheers!!!