Find Machines Which had Last Hardware Scan ( WQL Query )

select SMS_R_SYSTEM.ResourceID,SMS_R_SYSTEM.ResourceType,SMS_R_SYSTEM.Name,SMS_R_SYSTEM.SMSUniqueIdentifier,SMS_R_SYSTEM.ResourceDomainORWorkgroup,SMS_R_SYSTEM.Client from SMS_R_System inner join SMS_G_System_WORKSTATION_STATUS on SMS_G_System_WORKSTATION_STATUS.ResourceId = SMS_R_System.ResourceId where SMS_G_System_WORKSTATION_STATUS.LastHardwareScan < DateAdd(dd,-30,GetDate())