MySQL: Select N rows, but with only unique values in one column

Question

Given this data set:

ID  Name            City            Birthyear
1   Egon Spengler   New York        1957
2   Mac Taylor      New York        1955
3   Sara         


        

Answer 1

Something like that?

SELECT
  Id, Name, City, Birthyear
FROM
  TheTable
WHERE
  Id IN (SELECT TOP 1 Id FROM TheTable i WHERE i.City = TheTable.City ORDER BY Birthyear)