Sean Lange (3/14/2013)

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I haven't seen all the other threads but from what you posted I can't figure out why you are using DATEDIFF at all. It doesn't meet your requirements and it will make your query nonSARGable.

I think that something like this should meet your requirements. Of course as Lynn stated this doesn't accomodate NULL values in any of those columns.

[WorkForce_JobPosting].[Job Posting End Date_JP] < [WorkForce_WorkOrder].[Work Order End Date_WO]
AND
[WorkForce_WorkOrder].[Previous Work Order End Date_WO] <= [WorkForce_WorkOrder].[Work Order End Date_WO]

Lynn Pettis (3/14/2013)

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I gave him basically the same answer in another thread. He didn't like the answer because one or the other of the columns can be null. With that said, DATEDIFF suffers the same problem if a column is null.

dhananjay.nagarkar (3/14/2013)

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Hi Sean,

When you say-

"
I haven't seen all the other threads but from what you posted I can't figure out why you are using DATEDIFF at all. It doesn't meet your requirements and it will make your query nonSARGable"

Can you please help me understand why it does not meet my requirement?
Also Why and under what scenarios / situtations DateDiff function needs to be used and need not be used?
The solution you and Lynnhave provided that I already had beven before I joined this site, but using Predicates comparison for dates is not allowed in my team I have been asked to use DateDiff hence would be much obliged if you can justiy your reason and help me learn please so that I can convince my manager :)

Kind Regards
Dhananjay

declare @Date1 datetime, @Date2 datetime;
set @date1 = '20130314 19:23:30.000';
set @date2 = '20130314 19:23:45.000';
-- By observation @date1 is less than @date2

select
    @date1,
    @date2,
    case when @date1 < @date2 then '@date1 < @date2' else '@date2 <= @date1' end, -- will display @date1 < @date2: true
    case when datediff(day,@date1,@date2) > 0 then  '@date1 < @date2' else '@date2 <= @date1' end -- will display @date2 <= @date1: not true

using Predicates comparison for dates is not allowed in my team