How can I select adjacent rows to an arbitrary row (in sql or postgresql)?

Question

I want to select some rows based on certain criteria, and then take one entry from that set and the 5 rows before it and after it.

Now, I can do this numerically if ther

Answer 1

There's a lot of ways to do it if you run two queries with a programming language, but here's one way to do it in one SQL query:

(SELECT * FROM table WHERE id >= 34 AND active = 1 ORDER BY id ASC LIMIT 6)
UNION
(SELECT * FROM table WHERE id < 34 AND active = 1 ORDER BY id DESC LIMIT 5)
ORDER BY id ASC

This would return the 5 rows above, the target row, and 5 rows below.