If you want to report on the machines that do not have the ConfigMgr client installed within your Configuration Manager environment then you can run this query directly on your SQL database or you can use it to create a report within SSRS.
The query is below and can be altered to fit your own needs by adding columns and tables if or where required.
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 SMS_R_System.Client is null
If you have any questions or feedback about this post, or if you would like us to create any queries for you, please go ahead and leave us a message below in the comments section and we will get back to you as quick as we can.
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