Question

So i got this table:

+----+---------------------+-----+----------------+
| ID | WHEN                | OFF | (other..stuff) |
+----+---------------------+-----+----------------+
| 1  | 2012-09-17 17:00:00 | 0   | anything1      |
| 2  | 2012-09-17 18:00:00 | 0   | anything2      |
| 3  | 2012-08-31 21:00:00 | 1   | blabla321      |
| 4  | 2012-08-31 18:30:00 | 1   | blab32121      |
+----+---------------------+-----+----------------+

I want to select all keys but:

• Keys with off = 0 should be order by when ASC, and they should be
  displayed first
• Keys with off = 1 should be order by when DESC, and they should be
  displayed after (at the end)

I tried something like this:

(SELECT * FROM `table` WHERE `off` = 0 ORDER BY `when` ASC)
UNION
(SELECT * FROM `table` WHERE `off` = 1 ORDER BY `when` DESC)

But it doesn’t work.

Also check:
https://i.stack.imgur.com/WWBEr.jpg

Answer 1

select *
from `table`
order by `off`,
    case `off`
        when 0 then timestampdiff(second, current_timestamp, `when`)
        when 1 then timestampdiff(second, `when`, current_timestamp)
    end