Jak zkontrolovat existenci proměnné v databázi wordpress pomocí $wpdb

odstranit $wpdb z názvu tabulky. Kód bude fungovat

od

$count = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->pincode_distro1 WHERE pincode = '$the_order->shipping_postcode'");

do

$count = $wpdb->get_var("SELECT COUNT(*) FROM pincode_distro1 WHERE pincode = '$the_order->shipping_postcode'");