MySQL error #1064 near UNION version: 5.5.27

MySQL error #1064 near UNION version: 5.5.27

What's the problem?
SELECT post_title
FROM wp_posts
WHERE post_type='tutorial' AND post_status='publish'
LIMIT 3;
UNION
SELECT post_title FROM wp_posts
WHERE post_type='news' AND post_status='publish'
LIMIT 2;
It's showing error in mysql query box and definitely not working in
wordpress environment.