order by rand

SELECT 
    wp_posts.ID
FROM
    wp_posts
        LEFT JOIN
    wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
WHERE
    1 = 1 AND wp_posts.ID NOT IN (93110)
        AND (wp_term_relationships.term_taxonomy_id IN (8))
        AND wp_posts.post_type = 'post'
        AND ((wp_posts.post_status = 'publish'))
GROUP BY wp_posts.ID
ORDER BY RAND()
LIMIT 0 , 8