Jürgen Hohlkopf Jürgen Hohlkopf - 3 months ago 15x
SQL Question

Show same IDs together but ORDER BY timestamp

I have the following rows:

Person Age timestamp

Now I want that all rows to be sorted like this:
Order by timestamp, but Persons with the same Age should be grouped together!

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You want to order by the largest time for each age. Most databases support the ANSI standard window functions, so you can do:

select t.*
from t
order by max(timestamp) over (partition by age) desc,
         timestamp desc;

In the "databases" that don't (MS Access, SQLite, MySQL):

select t.*
from t join
     (select age, max(timestamp) as maxts
      from t
      group by age
     ) tt
     on t.age = tt.age
order by maxts desc, age, timestamp desc;