设置列值等于columnB减去columnA

Question

我希望将MySql列“时间”更新为列“ End_Time” 减去列“ Start_Time”

注意：End_Time和Start_Time为DATETIME格式。

谢谢

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)

在这里TIMESTAMPDIFF(minute将返回以分钟为单位的差异，并将其乘以* 60以获得秒，并使用SEC_TO_TIME将秒转换为时间。

Answer 2

在MySQL中使用Datediff函数

看到这里DATEDIFF

Answer 3

您可以使用TIMESTAMPDIFF函数。

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')
            );