获得两个日期之间的小时数差异

Question

How can I subtract two dates ( entry_date from status_change_date ) to get hours between them? I do this based on an IF statement where both dates are in YYYY,MM,DD 12:00:00 format

(IF Invoice_Num != next Inv_Num then entry_date - status_change_date else... 

It returns an answer in days instead of hours. I also tried using minutes(entry_day) and hours(status_change_date) in Crystal after the code was done, but I still got day values.

Answer 1

declare @startDate datetime
declare @endDate datetime

set @startDate = '2016-12-05 08:05:00';
set @endDate = '2016-12-05 09:52:00';

select CONVERT(varchar(3),DATEDIFF(minute,@startDate, @endDate)/60) + ':' +
          RIGHT('0' + CONVERT(varchar(2),DATEDIFF(minute,@startDate,@endDate)%60),2)
          as TotalHours

Check this example, get the hours and minutes between to datetime vars

Answer 2

From document TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) ,

SELECT TIMESTAMPDIFF(HOUR, '2016-12-05 12:00:00', '2016-12-06 12:00:00');

This will get you 24 hours.

SQLFiddle Demo