mysql - mysql：选择之间

Question

我对组功能的使用无效，不确定问题出在哪里

预期结果是从最大可用时间开始的 xxx 秒内的时间戳列表

请指教。

选择时间戳，response_time
从结果
WHERE id = XYZ AND 之间的时间戳
(SELECT MAX(timestamp) FROM results inn WHERE id = 22) AND
（从结果中选择时间戳，其中 id = 22 AND 时间戳 = MAX(timestamp) - XXX）
ORDER BY 时间戳 DESC

谢谢你

Answer 1

SELECT  timestamp, response_time
FROM    results
WHERE   id = @xyz
        AND timestamp BETWEEN
        ( 
        SELECT  MAX(timestamp)
        FROM    results
        WHERE   id = 22
        ) AND
        ( 
        SELECT  MAX(timestamp)
        FROM    results
        WHERE   id = 22
        ) - @xxx
ORDER BY
        timestamp DESC

确保您有一个索引，(id, timestamp)以便快速工作。