如何比较两个日期时间以查找SQL Server中的时差

Question

I have two columns

Column A:                 Column B: 
2017-08-24 14:01:00.000   2017-08-26 10:12:21.760. 

How would it be possible using T-SQL to find the difference between two dates in hours and minutes?

Answer 1

You can construct the results yourself:

select cast(s/3600 as varchar(255)) + ':' + right('00' + cast((s % 3600)/60 as char(2))) as hh:mm
from t cross apply
     (values datediff(second, cola, colb)) v(s);

The advantage of this approach over using time is that it can represent hours greater than 23.

Answer 2

Use datediff() function :

select dateadd(ss, datediff(ss, cola, colb), 0) as diff
from table t;

Answer 3

this is another option, it would give you a decimal as result, not sure what datatype you are looking for as result

Declare @dt1 DATETIME = '2017-08-25 00:00:00.000'
Declare @dt2 DATETIME = '2017-08-26 10:12:21.760'
SELECT DATEDIFF(SECOND,@dt1,@dt2)/3600.00