You mean this one
Select S.ID
FROM dbo.tblssms S
LEFT JOIN
(
Select ID,* from [DBname].[dbo].[tblAdditionalPrograms]
INNER JOIN [DBname].[dbo].[tblAdditionalProgramsDefs] ON [DBname].[dbo].[tblAdditionalPrograms].[RecCodeID] = [DBname].[dbo].[tblAdditionalProgramsDefs].[ID]
)P ON S.ID = P.ID