returnin category properties (id, link, etc)

Hi,

Ive tried hard to get this… but Im not beeing able to do something I beleive should be simple…

All I want is to retrieve the parent category link of the current post inside The Loop.

I want to do this: “AUTHORs NAME

My last try to get the category id was:

<blackticks>

<? global $id ?>
<?php $query = “

SELECT category_id

FROM $wpdb->post2cat

WHERE post_id = $id “;

$categoria = $wpdb->get_results($query);
echo $categoria->category_id;

?>
</blackticks>

I returns nothing…

any help?