This is a SQL problem. Your query is wrong. You forgot to include the term_relationships table in the query, yet reference it during the JOIN. By including the term_relationships table, that would solve the problem with the query.
SELECT ID, post_title, post_content, post_date
FROM {$wpdb->posts} AS p
JOIN {$wpdb->term_relationships} AS tr
ON tr.object_id = p.id
JOIN {$wpdb->term_taxonomy} AS tt
ON tt.term_taxonomy_id = tr.term_taxonomy_id
WHERE tt.term_id = 18
AND tt.taxonomy = 'category'
AND post_status="publish"
AND post_type="post"
ORDER BY post_date DESC
LIMIT 25
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