sql server - select query, compare null records -

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sql server - select query, compare null records -

i'm writing sql server query:

select * vwapplicationlist status='unassigned' , bbl '%' + @bbl + '%' , unitorappartmentnumber '%'+@appartment+'%' , residencetypedescription '%'+@residencetypedescription+'%' , sn1 '%'+@sn1+'%' , sn2 '%'+@sn2+'%'

the problem field "sn2" null in several records. how can compare them?

if want positive result on comparison:

... , coalesce(sn2, @sn2) '%' + @sn2 + '%'

if want negative result (assuming @sn2 not empty string):

... , coalesce(sn2, '') '%' + @sn2 + '%'

sql-server select null

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