set column values等于columnB减去columnA

Question

我希望我的MySql列'时间'更新为列'End_Time'减号列'Start_Time'

注意：End_Time＆amp; Start_Time采用DATETIME格式....

由于

Answer 1

试试这个方法，

SELECT SEC_TO_TIME(TIMESTAMPDIFF(second,Start_Time,End_Time)) --include sec
or
SELECT SEC_TO_TIME(TIMESTAMPDIFF(minute,Start_Time,End_Time)*60) --diff in minute

eg

SELECT SEC_TO_TIME(TIMESTAMPDIFF(minute,'2016-05-04 10:00:00','2016-05-04 11:29:00')*60)

此处TIMESTAMPDIFF(minute将以分钟为单位返回差异，并将其复制为* 60以获得秒数，并使用SEC_TO_TIME将秒数转换为时间。

Answer 2

在mysql中使用Datediff函数

See here for DATEDIFF

Answer 3

您可以使用TIMESTAMPDIFF功能。

SELECT TIMESTAMPDIFF(minute, '2015-06-01 13:13:55', '2015-06-03 10:15:20')

SELECT TIMESTAMPDIFF(second, '2015-06-01 13:13:55', '2015-06-03 10:15:20')

SELECT TIMESTAMPDIFF(hour, '2015-06-01 13:13:55', '2015-06-03 10:15:20')

Answer 4

update table 
set Time = (select 
            to_timestamp(End_Time,'yyyy-mm-dd hh24:mi:ss') - to_timestamp(Start_Time,'yyyy-mm-dd hh24:mi:ss')
            );