Question

http://thedailywtf.com/Articles/The-Hot-Room.aspx

You see how at the bottom there’re links to the next and previous articles (‘Unprepared For Divide_By_Zero’ and ‘A Completely Different Game’)? How do I do that, but selecting the next and previous non-private articles? This works for selecting the next article:

SELECT * FROM articles WHERE id > ? AND private IS NULL 

But I cannot find a way to select the previous article.

What is the proper/efficient way to do this, preferably in one query?

Answer 1

Or extending Jeremy’s answer…
In one query

(SELECT * FROM articles WHERE id > ?   AND private IS NULL   ORDER BY id ASC LIMIT 1)  UNION  (SELECT * FROM articles WHERE id < ?   AND private IS NULL   ORDER BY id DESC LIMIT 1)