Get Featured Image via direct sql query

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I know you can use the wordpress methods for getting a featured image, however with this particular project I need to get the featured image via mysql query. Can anyone point me in the right direction. Thank you.

This is what I have so far but my query is not doing the trick. I have the $post->id stored as a variable called $da_id

            $Featured_image = $wpdb->get_results("
            SELECT *
            FROM net_5_postmeta  
            INNER JOIN net_5_posts ON net_5_postmeta.post_id=net_5_posts.ID 
            WHERE post_parent = $da_id
            AND meta_key = '_wp_attached_file' 
            ORDER BY post_date 
            DESC LIMIT 15",'ARRAY_A');
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2 comments 

  1. $Featured_image = $wpdb->get_results("
    SELECT p.*
      FROM net_5_postmeta AS pm
     INNER JOIN net_5_posts AS p ON pm.meta_value=p.ID 
     WHERE pm.post_id = $da_id
       AND pm.meta_key = '_thumbnail_id' 
     ORDER BY p.post_date DESC 
     LIMIT 15
",'ARRAY_A');

  2. A related solution, to query for posts WITHOUT providing a post ID (ordered by post date, and using the wp_ database prefix):

        SELECT
        p1.*,
        wm2.meta_value
    FROM 
        wp_posts p1
    LEFT JOIN 
        wp_postmeta wm1
        ON (
            wm1.post_id = p1.id 
            AND wm1.meta_value IS NOT NULL
            AND wm1.meta_key = "_thumbnail_id"              
        )
    LEFT JOIN 
        wp_postmeta wm2
        ON (
            wm1.meta_value = wm2.post_id
            AND wm2.meta_key = "_wp_attached_file"
            AND wm2.meta_value IS NOT NULL  
        )
    WHERE
        p1.post_status="publish" 
        AND p1.post_type="post"
    ORDER BY 
        p1.post_date DESC