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

That will work absolutely. Try first, then argue. When you have multiple order by you can do this(example made on Oracle):

-- this one with keep dense_rank

WITH a AS (SELECT 1 s1, 4 s2, 'a' c,  10 g FROM dual UNION all
           SELECT 2 s1, 2 s2, 'b' c,  10 g FROM dual UNION ALL
           SELECT 3 s1, 1 s2, 'c' c,  20 g FROM dual UNION ALL
           SELECT 4 s1, 3 s2, 'd' c,  20 g FROM dual)
SELECT g,
       MAX(c) KEEP (DENSE_RANK FIRST ORDER BY s1) s1,
       MAX(c) KEEP (DENSE_RANK FIRST ORDER BY s2) s2
  FROM a
 GROUP BY g

-- This one without keep dense_rank

    WITH a AS (SELECT 1 s1, 4 s2, 'a' c,  10 g FROM dual UNION all
               SELECT 2 s1, 2 s2, 'b' c,  10 g FROM dual UNION ALL
               SELECT 3 s1, 1 s2, 'c' c,  20 g FROM dual UNION ALL
               SELECT 4 s1, 3 s2, 'd' c,  20 g FROM dual)
SELECT g,
       MAX(DECODE(s1, 1, c)) s1,
       MAX(DECODE(s2, 1, c)) s2
  FROM (SELECT g,c,
               ROW_NUMBER() OVER (PARTITION BY g ORDER BY s1) s1,
               ROW_NUMBER() OVER (PARTITION BY g ORDER BY s2) s2 
          FROM a) b
 GROUP BY g