我需要计算一个日期时间列之间的日期/时间差

Question

详细信息。 我有笔记表具有以下列。

ID  - INT(3) 
Date  - DateTime 
Note  - VARCHAR(100) 
Tile  - Varchar(100) 
UserName - Varchar(100) 

现在这张表将会在指定的日期/时间有NOTES以及UserName输入的标题。

我需要计算在同一列

例如上表中具有的表中的信息这peice的两行之间的DateTimeDifference。

64, '2010-03-26 18:16:13', 'Action History', 'sending to Level 2.', 'Salman Khwaja' 
65, '2010-03-26 18:19:48', 'Assigned By', 'This is note one for the assignment of RF.', 'Salman Khwaja' 
66, '2010-03-27 19:19:48', 'Assigned By', 'This is note one for the assignment of CRF.', 'Salman Khwaja' 

现在我需要在使用MYSQL的查询报告中有以下结果集。

TASK    - TIME Taken 
ACTION History  - 2010-03-26 18:16:13 
Assigned By   - 00:03:35 
Assigned By   - 25:00:00 

更聪明的办法是

TASK    - TIME Taken 
ACTION History  - 2010-03-26 18:16:13 
Assigned By   - 3 minutes 35 seconds 
Assigned By   - 1 day, 1 hour. 

我将不胜感激如果可以给我平淡QUERY用PHP代码一起嵌入到这一点。

Answer 1

<?php 
$start = new DateTime('2009-01-01 00:00:00'); // 31 days 
$time_span = $start->diff(new DateTime('2009-02-01 00:00:00')); 
var_dump($time_span); // returns '1 month' 

$start = new DateTime('2009-02-01 00:00:00'); //28 days 
$time_span = $start->diff(new DateTime('2009-03-01 00:00:01')); 
var_dump($time_span); // returns '1 month' 
?> 

Answer 2

DATEDIFF()

Answer 3

它看起来像你想按病例数。

使用您的架构和样本数据，我认为这是你想要什么：

SELECT t1.ID, t1.title AS task, t1.username, 
    IFNULL(CONCAT(TIMESTAMPDIFF(MINUTE, t2.currentDate, t1.currentDate)), t1.currentdate) AS time_taken 
FROM tps_trans_support_notes t1 
LEFT JOIN tps_trans_support_notes t2 
    ON t2.currentdate < t1.currentdate AND 
    t2.ID <> t1.ID AND 
    t2.casenumber = t1.casenumber 
LEFT JOIN tps_trans_support_notes t3 
    ON t3.casenumber = t1.casenumber AND 
    t3.ID <> t1.ID AND t3.ID <> t2.ID AND 
    t3.currentdate > t2.currentdate AND 
    t3.currentdate < t1.currentdate 
WHERE t3.ID IS NULL AND 
    t1.casenumber = '21' 
ORDER BY t1.ID 

首先，查询获取的开始时间和结束时间到同一行，但不包括其中有次行发生在两者之间，然后显示差异。

该查询只显示以分钟为单位的差异，但您可以使用其他DateTime函数来扩展该差异。