SQL – Group records together based on value

Currently I have a table with the following values:

  some-id   timestamp
 --------- -----------
      1       12:45
      1       12:50
      2        3:13
      2        3:15
      3       11:33
      3       11:50

I would like a resulting SELECT to return the below:

  some-id   timestamp_a   timestamp_b
 --------- ------------- -------------
      1       12:45         12:50
      2        3:13          3:15
      3       11:33         11:50

eg. The timestamp is grouped by a duplicate some_id

Is this possible with SQL?

Answer

This appears to be just a simple aggregation,

select some-id, Min(Timestamp) Timestamp_a, Max(Timestamp) Timestamp_b
from t
group by some-id