Question

我正在尝试将n个最近的条目列表添加到数据库中，但是将它们按升序排序。

显然我可以使用以下内容来获得前n个条目：

SELECT owner_id,message 
FROM messages
WHERE thread_id = ? 
ORDER BY time ASC
LIMIT ?

或者这可以获得最近的5个，降序：

SELECT owner_id,message 
FROM messages
WHERE thread_id = ? 
ORDER BY time DESC
LIMIT ?

但是如何以升序排列最近的5？我可以在PHP中反转数组的顺序，但这看起来效率不高。

Answer 1

Select * from
(SELECT owner_id,message,time 
FROM messages
WHERE thread_id = ? 
ORDER BY time DESC
LIMIT ?) test
Order by time ASC

<强> Sample fiddle

Answer 2

select owner_id,message from (
    SELECT owner_id,message,time 
    FROM messages
    WHERE thread_id = ? 
    ORDER BY `time` DESC
    LIMIT ?
) temp
order by time ASC

MySQL最近n个条目，升序？

2 个答案: