sql server - Calculating the difference bwteen dates in a specificed date range -

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i'm trying calculate days between 2 dates rows faly within 2 dates only.

essentially if record falls in financial year '2012-11-01 00:00' , '2013-10-31 23:59' want know how many nights there between b.depart , end of year, ie '2013-10-31 23:59'.

the error is:

conversion failed when converting varchar value 'null' data type int.

this have got to: 

 case   when b.depart between '2012-11-01 00:00' , '2013-10-31 23:59' datediff (minute, b.depart, '2013-10-31 23:59')  else 'null'   end '2012/13 nights'

help appreciated!

 case   when b.depart between '2012-11-01 00:00' , '2013-10-31 23:59' datediff (minute, b.depart, '2013-10-31 23:59')  else null  end '2012/13 nights'

instead of 'null' treated varchar, go null.


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