更新时间字段最接近的数据库条目（）

Question

我有MySQL数据库表的结构描述如下。

uid   info   time 
6   null   2013-04-12 23:00:00 
5   something  2013-04-12 22:00:00 
4   something  2013-04-10 09:00:00 
3   something  2013-04-09 19:00:00 
2   something  2013-04-02 10:00:00 
1   something  2013-04-01 11:00:00 

在单个MySQL查询中如何更新具有最新时间值的行？

一个可能的解决方案是

SELECT uid FROM my_table ORDER BY time DESC LIMIT 1 
UPDATE my_table SET info = 'something' WHERE uid = 'uid_received_in_previuos_query' 

却是两个连续的查询，解决方案......

Answer 1

这就是我正在寻找

UPDATE my_table SET info = 'something' ORDER BY time DESC LIMIT 1; 

Answer 2

如果我得到它的权利，你要寻找的MySQL NOW() function。

用例：

UPDATE my_table SET info='something', time=NOW() WHERE id=6 

或者，如果你正在寻找最新的一行什么UDPATE，你可以

UPDATE my_table SET info='something', time=NOW() ORDER BY time DESC LIMIT 1 

Answer 3

你可以做到这一点，如下

WHERE time > '2013-04-12 00:00:01' and time < '2013-04-12 23:59:59' 

For Dynamic Date

WHERE time > date ("Y-m-d").'00:00:01' and time < date ("Y-m-d").'23:59:59' 

Answer 4

这应该工作

update tableName first inner join (SELECT uid FROM tableName ORDER BY time DESC LIMIT 1) as second SET first.info = 'something' where first.uid = second.uid