Query to return 1 instance of a record with duplicates

Question

INFO: I am working with Microsoft SQL.
Ok the title is confusing but here is an example of the table I\'m working with:

ID    Value    Signal    Read             


        

Answer 1

SELECT Id, Value, Signal, Read, Firmware, Date, Time FROM table_name t1 WHERE t1.Id = (SELECT DISTINCT t2.Id FROM table_name t2)

Assuming that there is a check so that records with the same Id also have same Value