sql - difference in days between two dates -

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i new @ this. need in seperate column in query have difference in days between t.1start , t1.finish.

thanks ,louie

select row_number() over(order town) 'row',  t1.surname, t1.forename, t1.town, t1.description, t1.sex, t1.dob, t1.start, t1.finish, dbo.viewservicecontractfull t1  t1.finish>='2013/01/01' ,  t1.finish<='2013/01/31'

how towns come in query?

select row_number() over(order town) 'row',  t1.surname, t1.forename, t1.town, t1.description, t1.sex, t1.dob, t1.start, t1.finish, cast(datediff(day,t1.start,t1.finish) varchar) difference dbo.viewservicecontractfull t1  t1.finish>='2013/01/01' ,  t1.finish<='2013/01/31'

additionally have @ this


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