Add two timestamp columns

Question

I have 2 timestamp columns in a table
Columnname    type
LoginTime          Timestamp
LogoutTime        TimeStamp
Need to find total hours... how to add 2 timestamp columns.. help me...

Answer 1

Abi,
As pointed out by Olaf, you are looking for the DATETIME type and not TIMESTAMP. The latter is just a rowversion value that helps to identify the version of each row inserted. The DATETIME type helps you to store YYYY-MM-DD HH:MM:SS.xxx format values as
required.
If your requirement is to find out the DIFFERENCE numebr of hours between the login and logout then the below query 1 shud help.
(Im not sure what you mean by TOTAL hours - ADDING the two timestamp values.. If your looking at the total number of hours passed from day zero, then query might as well help. Pls let us know if otherwise)
create table #temp
LoginTime datetime,
Logouttime datetime
insert #temp select getdate(),'2014-03-18 23:04:42.790'
insert #temp select getdate()-0.5,'2014-03-18 18:04:42.790'
insert #temp select getdate(),'2014-03-18 20:04:42.790'
--QUERY1:Finding the difference between the Login and logout times
select
Logintime,
Logouttime,
datediff(hour,LoginTime,Logouttime) as diff_hours
from #temp
--QUERY2:To find the SUM of hours of Login and logout
select
Logintime,
Logouttime,
datediff(hour,0,Logouttime) + datediff(hour,0,Logintime) as SUM_hours
from #temp
--cleanup
drop table #temp
Thanks,
Jay
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