sql - 特定のケースでのみ SQL JOIN

Question

そのレコードのビット フィールドが 0 である行でのみテーブルを結合する必要があるストアド プロシージャがあります。これは可能ですか? これが私が持っている/必要なものです

  SELECT TOP 100 
    SR.ServiceRecordID, 
    dbo.fn_ServiceRecordGetServiceName(SR.ServiceRecordID,''), 
    SR.LocationStd, 
    SR.AreaServedStd, 
    SR.RegionalLimited, 
    R.Region,
    CASE WHEN (ISNULL(R_SR.RegionID,0) = 0 AND ISNULL(R_SR_Serv.RegionID,0) = 0)
                     THEN 0 ELSE 1 END AS Visible,
    NULL
   FROM ServiceRecord SR
     INNER JOIN Sites S 
        ON SR.SiteID = S.SiteID
     INNER JOIN Regions R 
        ON R.SiteID = S.SiteID
     LEFT OUTER JOIN lkup_Region_ServiceRecord R_SR 
        ON R_SR.RegionID = R.RegionID 
           AND R_SR.ServiceRecordID = SR.ServiceRecordID
--and this is the additional join I need ONLY if RegionalLimited = 0
CASE WHEN SR.RegionalLimited = 0 THEN 
    LEFT OUTER JOIN lkup_Region_ServiceRecord_Serv R_SR_Serv 
         ON R_SR_Serv.RegionID = R.RegionID 
                        AND R_SR_Serv.ServiceRecordID = SR.ServiceRecordID 
END
WHERE SR.SiteID = @SiteID
    AND R.RegionID % 100 != 0