Question

所以我得到了这张桌子：

+----+---------------------+-----+----------------+
| 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      |
+----+---------------------+-----+----------------+

我想选择所有键，但是：

off = 0的键应该在ASC时排序，它们应该是首先显示
off = 1的键应该在DESC时按顺序排列，它们应该是在（最后）

我试过这样的事情：

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

但它不起作用。

同时检查： http://i.imgur.com/81Hzq.jpg

Answer 1

试试这个：

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

我认为WHEN是一个关键字，必须引用。

Answer 2

SELECT * 
FROM table 
ORDER BY CASE WHEN off = 0 THEN `when` END ASC,
         CASE WHEN off = 1 THEN `when` END DESC

Answer 3

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

MySQL选择多个顺序

3 个答案: