Mysql DateTime组15分钟 [英] Mysql DateTime group by 15 mins

问题描述

我有一张这样的表格

  CREATE TABLE`time_table`（
`id` INT 10）NOT NULL AUTO_INCREMENT，
`creationDate` DATETIME NOT NULL，
 PRIMARY KEY（`id`）
）
  

我基本上存储表中某些记录的创建时间。我知道如果我想得到在15分钟间隔内创建的记录的数量，我将使用这样的东西

  SELECT FLOOR（UNIX_TIMESTAMP（creationDate）/ 900）AS t，
 COUNT（*）FROM time_table 
 GROUP BY t 
  

给我这样的东西

  t COUNT（*）
 1434187 1 
 1434188 3 
 1434189 2 
 1434190 2 
  

第一列的感觉？如果我想要给我看看像

  t COUNT（*）
 2:00 pm  -  2:15 pm 1 
 2:15 pm  -  2:30 pm 3 
 2:30 pm  -  2:45 pm 2 
 2:45 pm  -  3:00 pm 2 
  

我明白，通过一些操纵，我可以在下午2点15分得到1434187。即使这可能是一个好的开始....然后有一些逻辑，我可以显示整个时期。谢谢！

解决方案

一种方法是使用> code> 为了获得一个范围内的所有内容，但您可能会发现这更简单：

  SELECT ... 
 
 GROUP BY（4 * HOUR（thistime）+ FLOOR（MINUTE（thistime）/ 15））
  / pre> 
 
 
从
  http://forums.mysql.com/read.php?10,202789,202807  
 
I have a table that looks like this
CREATE TABLE `time_table` (
 `id` INT(10) NOT NULL AUTO_INCREMENT,
 `creationDate` DATETIME NOT NULL,
 PRIMARY KEY (`id`)
)
I basically store the creation time of certain records in the table. I know if I want to get a count of the records that were created in 15 mins interval I will use something like this
SELECT FLOOR(UNIX_TIMESTAMP(creationDate)/900) AS t, 
COUNT(*) FROM time_table
GROUP BY t
That gives me something like this
t          COUNT(*)
1434187    1
1434188    3
1434189    2
1434190    2
How do I make sense of the first column? If I want it to show me something like
t                 COUNT(*)
2:00pm - 2:15pm   1
2:15pm - 2:30pm   3
2:30pm - 2:45pm   2
2:45pm - 3:00pm   2
I understand that with some manipulation I could get 1434187 to show up at 2:15pm. Even that might be a good start....then with some logic I could show the entire period. Thanks!
解决方案
One way is to just use > and < in order to get everything within a range, but you may find this to be simpler:
SELECT ... 

GROUP BY ( 4 * HOUR( thistime ) + FLOOR( MINUTE( thistime ) / 15 )) 
from
http://forums.mysql.com/read.php?10,202789,202807

                        
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