SQL Server: how to imitate oracle keep dense_rank query?

Question

I have an Oracle query

select max(m.id),
       m.someId keep (DENSE_RANK FIRST ORDER BY m.UpdateDate desc) 
from MyTable m 
groupBy m.someId

Answer 1

In case someone look for Oracle KEEP DENSE_RANK simulation in Postgres:

CREATE TABLE myt (
  "id" INTEGER,
  "update_date" timestamp,
  "some_id" INTEGER
);

INSERT INTO myt
  ("id", "update_date", "some_id")
VALUES
  ('1', '2012-01-20', '10'),
  ('2', '2012-01-20', '10'),
  ('3', '2012-01-01', '10'),
  ('4', '2012-10-02', '20'),
  ('5', '2012-01-02', '20'),
  ('6', '2012-01-04', '30');                         


select
    some_id, 
    (array_agg(id order by update_date desc, id desc))[1]
from myt
group by some_id
order by some_id