我需要計算一個日期時間列之間的日期/時間差

Question

詳細信息。 我有筆記表具有以下列。

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

現在這張表將會在指定的日期/時間有NOTES以及UserName輸入的標題。

我需要計算在同一列

例如上表中具有的表中的信息這peice的兩行之間的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' 

現在我需要在使用MYSQL的查詢報告中有以下結果集。

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

更聰明的辦法是

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

我將不勝感激如果可以給我平淡QUERY用PHP代碼一起嵌入到這一點。

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

它看起來像你想按病例數。

使用您的架構和樣本數據，我認爲這是你想要什麼：

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，查詢獲取的開始時間和結束時間到同一行，但不包括其中有次行發生在兩者之間，然後顯示差異。

該查詢只顯示以分鐘爲單位的差異，但您可以使用其他DateTime函數來擴展該差異。