SCCM 2012 - Newly discovered machines in the last 24 hours
If you want to identify machines that have been newly discovered within the last 24 hours, then you have use the query below.

 select  
      SMS_R_System.Name,   
      SMS_R_System.CreationDate   
 from SMS_R_System  
      where DateDiff(dd,SMS_R_System.CreationDate, GetDate ()) <= 1

If you want to change the 24 hours value, then just amend the where value of 1 (this is a day value not hour value) to whatever you want it to be.

If you have any problems with this query, please leave a comment below.

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