Report machines installed windows hotfix

Hi,

I'm trying to run an SQL query to find machines with a particular hotfix installed. However, I'm not sure if the result is accurate based on the query below as when i compared it with other report, the numbers of machines are incorrect.

Am I doing it wrong ? Appreciate if anyone can help me on this?

Thank you in advance...

SELECT

   [vrc].[Guid] AS [_ItemGuid],

   [vrcr].[Name],

   [PW].[PATCH ID]

FROM

   [vRM_Computer_Item] AS [vrc]

      LEFT OUTER JOIN [Inv_SW_Patch_Windows] AS [pw]

         ON ([vrc].[Guid] = [pw].[_ResourceGuid])

WHERE [pw].[Patch ID] LIKE N'%KB3176493%'