Mysql基于时、日、月、年的Select语句

我有一张有价值的桌子，看起来像这样

id         time_stamp                    value    
1          2013-01-01 00:00:15           10
2          2013-01-01 01:00:15            5
3          2013-01-02 00:00:15           15
4          2013-01-02 01:00:15           20
5          2013-02-01 00:00:15           18
6          2013-02-01 01:00:15           15
7          2013-02-02 00:00:15           5
8          2013-02-02 01:00:15           17
9          2014-01-01 00:00:15           8
10         2014-01-01 01:00:15            5
11         2014-01-02 00:00:15           15
12         2014-01-02 01:00:15           30
13         2014-02-01 00:00:15           18
14         2014-02-01 01:00:15           15
15         2014-02-02 00:00:15           5
16         2014-02-02 01:00:15           17

从这个表中，我想根据小时、天、月、年选择第一个记录值和最后一个记录值 例如，我选择基于的值

日期：

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我如何做到这一点？

使用mysql的聚合函数，如以下

SELECT 
    t.id, 
    DATE_FORMAT(t.time_stamp, "%Y-%m-%d") AS time_stamp, 
    (SELECT `value` FROM table_name WHERE time_stamp BETWEEN DATE_FORMAT(t.time_stamp, "%Y-%m-%d 00:00:00") AND DATE_FORMAT(t.time_stamp, "%Y-%m-%d 23:59:59") ORDER BY id ASC LIMIT 1) AS start_value,
    (SELECT `value` FROM table_name WHERE time_stamp BETWEEN DATE_FORMAT(t.time_stamp, "%Y-%m-%d 00:00:00") AND DATE_FORMAT(t.time_stamp, "%Y-%m-%d 23:59:59") ORDER BY id DESC LIMIT 1) AS end_value
FROM table_name t 
GROUP BY DATE_FORMAT(t.time_stamp, "%Y-%m-%d")

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我在查询中提供了额外的参数，以帮助您保持查询的灵活性：）

所需的

groupby

子句在哪里？我不需要最小值和最大值。我只需要第一个记录值&小时、天、月和年的最后一个记录值。当您使用最小值和最大值时，不需要一个记录值，这就像在计数（*）查询中询问GROUP BY在哪里……所以您不关心时间的时间顺序？您想要基于ID的时间戳吗？我只关心时间戳asc，而不关心idselect*从表中选择，其中时间戳按天在“2012-01-01”和“2012-02-01”组之间（时间戳）

SELECT 
    t.id, 
    DATE_FORMAT(t.time_stamp, "%Y-%m-%d") AS time_stamp, 
    (SELECT `value` FROM table_name WHERE time_stamp BETWEEN DATE_FORMAT(t.time_stamp, "%Y-%m-%d 00:00:00") AND DATE_FORMAT(t.time_stamp, "%Y-%m-%d 23:59:59") ORDER BY id ASC LIMIT 1) AS start_value,
    (SELECT `value` FROM table_name WHERE time_stamp BETWEEN DATE_FORMAT(t.time_stamp, "%Y-%m-%d 00:00:00") AND DATE_FORMAT(t.time_stamp, "%Y-%m-%d 23:59:59") ORDER BY id DESC LIMIT 1) AS end_value
FROM table_name t 
GROUP BY DATE_FORMAT(t.time_stamp, "%Y-%m-%d")