If you want to make RSS to use data from another table, you need to edit the_excerpt_rss() function in wp-includes/feed.php file, change

$output = get_the_excerpt(true);

to something like this:

function the_excerpt_rss() {
// $output = get_the_excerpt(true);
global $wpdb, $post;
$postID = $post->ID;
$grants = $wpdb->get_results(”select abstract
from grants where post_id= $postID”);
$output=”";
foreach ($grants as $grant)
{
$output=$grant->abstract;
}

echo apply_filters('the_excerpt_rss', $output);
}

Or (the best way), write your own function like this:

function the_abstract_rss() {
global $wpdb, $post;
$postID = $post->ID;
$grants = $wpdb->get_results(”select abstract
from grants where post_id= $postID”);
$abs=”";
foreach ($grants as $grant)
{
$abs=$grant->abstract;
}
echo $abs;
}

then apply filter:

add_filter('the_excerpt_rss','the_abstract_rss');

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