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?
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)
Here's how I would do it:
-- next
SELECT * FROM articles WHERE id > ? AND private IS NULL ORDER BY id ASC LIMIT 1
-- previous
SELECT * FROM articles WHERE id < ? AND private IS NULL ORDER BY id DESC LIMIT 1
I'm not sure how to do it in one query. The only thing I can think of is possibly getting both the article you're displaying and the next article in one query, but that might be too confusing.
How about a nested select?
SELECT * FROM articles WHERE id IN (
SELECT id FROM articles WHERE id > ? AND private IS NULL ORDER BY id ASC LIMIT 1)
)
OR id IN (
SELECT id FROM articles WHERE id < ? AND private IS NULL ORDER BY id DESC LIMIT 1
);
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