MySql选择每小时的最后一个时间戳

Question

我需要选择表中每个小时的最后一个“关闭”值。我已经看到这个问题的其他答案，但他们似乎没有为我工作。

Answer 1

使用这样的事情：

SELECT a.mydate, b.`close` 
FROM (
    SELECT max(t.`date`) AS mydate 
    FROM yourTable t 
    GROUP BY DATE_FORMAT(t.`date`,"%Y%m%d%H") 
) a 
LEFT JOIN yourTable b ON a.mydate = b.`date` 
ORDER BY a.`date`; 

Answer 2

我适应贝恩德Buffen的答案。他的查询正确选择了每个小时的最后一个时间戳，但是关闭的值错误。我的查询下面选择正确的关闭值。

SELECT table1.close 
FROM `GBPUSD_minutes` table1 
INNER JOIN(
    SELECT max(`date`) as last FROM `GBPUSD_minutes` GROUP BY DATE_FORMAT(`date`,"%Y%m%d%H") 
) table2 
    on table1.date = table2.last 
WHERE `date` > '2010-01-01 00:00:00' AND `date` < '2010-01-30 00:00:00' 

由于贝恩德Buffen给我

DATE_FORMAT(`date`,"%Y%m%d%H") 

Answer 3

试试这个。

SELECT t1.* FROM mytable t1 
WHERE t1.`date` = (SELECT MAX(`date`) FROM mytable t2 
    WHERE DATE(t1.`date`) = DATE(t2.`date`) AND HOUR(t1.`date`) = HOUR(t2.`date`) 
);