Question

I have datetime stored in my table in the fields LeaveFrom and LeaveTo for leaves, something like

LeaveFrom = 05/26/2012 12:00:00 and LeaveTo = 06/30/2012.. and so on

From front end i am passing only Month and Year. So what will be the search condition for the same.

I need criteria for month and year wise searching. How many peoples applied for leave / or were absent in the particular month.

Thanks to all of you.. almost all were close to expected …thanks,what i need was a ‘HINT’.. thanks a ton to all of you guys..

Answer 1

As far as I can tell, you want all rows that has overlap between LeaveFrom and LeaveTo with the chosen month. I provided some sample dates as documentation.

declare @yourtable table(LeaveFrom datetime, LeaveTo datetime)
insert @yourtable values('2012-05-26 12:00:00', '2012-06-30')
insert @yourtable values('2012-01-26 12:00:00', '2012-12-30')
insert @yourtable values('2012-01-26 12:00:00', '2012-04-30')
insert @yourtable values('2012-05-26 12:00:00', '2012-12-30')
insert @yourtable values('2012-01-26 12:00:00', '2012-05-30')
insert @yourtable values('2012-06-26 12:00:00', '2012-12-30')
insert @yourtable values('2011-01-01 12:00:00', '2011-01-01')

declare @month tinyint = 5
declare @year int = 2012

-- calculate a data corresponding to month and year (2012-05-01)
declare @date datetime= dateadd(month, (@year-1900) * 12 + @month-1, 0)

select * from @yourtable
where datediff(month , LeaveFrom, @date) between 0 and datediff(month , LeaveFrom, LeaveTo)

EDIT: another possible way with same result:

select * from @yourtable
where @date between dateadd(month, datediff(month, 0, LeaveFrom), 0) 
and dateadd(month, datediff(month, 0, LeaveTo), 0) 

Result:

LeaveFrom               LeaveTo
----------------------- -----------------------
2012-05-26 12:00:00.000 2012-06-30 00:00:00.000
2012-01-26 12:00:00.000 2012-12-30 00:00:00.000
2012-05-26 12:00:00.000 2012-12-30 00:00:00.000
2012-01-26 12:00:00.000 2012-05-30 00:00:00.000