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SQL query

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Last Modified: 2012-08-13
Experts,
I have pasted a piece from my stored procedure here. When @ssid id is not null but @RegionID is null there are values in DB that should be returned but this query does not. And same way if there are results for @RegionID is not null then there are results in Db but this query does not return those. I want it to work in any situation whether all the three variables are null or not it should display proper results. Can that be achieved ..?
declare @ssid varchar(max)
declare @stid varchar(max) 
declare @RegionID varchar(10) 
 
set @ssid='acd5eb63-6cf5-4ae0-9d26-afa76f2cd83f'
set @stid=''
set @RegionID=''
 
 
select distinct  cstitle as PageTitle,substring(convert(varchar(4000),csChallenge),0,150)+'...' as Excerpt,'Client Success' as AreaName,'' 
as OfficeName,convert(varchar(38),tbl_CS_Master.csID) as csid                               
,'' as ksID                
,'' as "Filename"            
,'' as ks_FName ,'' as ks_LName                      
from tbl_CS_Master left  join tbl_cs_service on tbl_cs_service.csid=                                  
tbl_CS_Master.csid left  join  tbl_CS_Regions on tbl_CS_Master.csID = tbl_CS_Regions.csID where 
(convert(varchar(36),tbl_cs_service.ssid) in                                   
(select cast(value as uniqueidentifier) from dbo.ParmsToList(@ssid)) or @ssid is null) 
and (tbl_CS_Regions.RegionID in (select cast( value as int) from dbo.ParmsToList(@RegionID)) or @RegionID is null)

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