MECM/SCCM – WQL: Collection New Devices from the Last 7 days

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 WHERE DateDiff(dd,SMS_R_System.CreationDate, GetDate()) <= 7