sql server - DateDiff returns negative value in sql -


i doing calculation in sql query using datediff function. calculation went wrong if datediff value came in negative

declare @actualtime numeric(10,2)=677.00  select convert(numeric(10,2),(100*((@actualtime-(convert(numeric(10,2),convert(varchar(10),sum(datediff(minute,vendorticketraisedon ,closedon)) / 60)+'.'+       right('00'+convert(varchar(2),sum(datediff(minute, vendorticketraisedon , closedon)) % 60),2))))/@actualtime*1)))[ags uptime %]       ticket

two columns vendorticketraisedon & closedon of type datetime. if closedon > vendorticketraisedon value came in negetive.

how treat case produce result 0 ?

if value in negative datediff should give output 0 instead of -value

db : sql server 2008

query:

declare @actualtime numeric(10,2)=677.00  select case when closedon > vendorticketraisedon              0        else convert(numeric(10,2),(100*((@actualtime-(convert(numeric(10,2),convert(varchar(10),sum(datediff(minute,vendorticketraisedon ,closedon)) / 60)+'.'+ right('00'+convert(varchar(2),sum(datediff(minute, vendorticketraisedon , closedon)) % 60),2))))/@actualtime*1)))       end [ags uptime %] ticket

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