sql - How to return all values if Param is null -


i want customize stored procedure, in case param value @townid null returns data in table. otherwise returns correct data. in table there no nulls in townid column. there nvarchar values. didn't success data if send @townid=null client side 

alter procedure dbo.getcustomerspagewisewithtown @pageindex int = 1   ,@pagesize int = 10   ,@pagecount int output   ,@townid int    set nocount on;   select row_number() on         (               order ispaid desc         )as rownumber   ,b.id   ,b.name   ,b.phone1   ,b.town   ,b.addess   ,b.ispaid   ,b.defaultimage   ,t.townname   #results   businessfulldata b     left join towns t on b.town = t.id      ((b.isvisable=1) , (b.town=@townid))   declare @recordcount int   select @recordcount = count(*) #results    set @pagecount = ceiling(cast(@recordcount decimal(10, 2)) / cast(@pagesize decimal(10, 2)))   print       @pagecount    select * #results   rownumber between(@pageindex -1) * @pagesize + 1 and(((@pageindex -1) * @pagesize + 1) + @pagesize) - 1    drop table #results return

thanks lot advise,

just add condition where clause:

                             v-------------v  ((b.isvisable=1) , (@townid null or b.town=@townid))

also note isvisible spelled wrong.


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