Doubt in Group by

Question

I have doubt in group by clause.
System_log table contains
server_id,
system_cpu,
user_cpu,
time_log
as fields
I want to display distinct servers order by (system+user)
SELECT server_id
FROM system_log
WHERE time_log IN (SELECT MAX(time_log)
FROM system_log
GROUP BY server_id)
ORDER BY (system+ user) ASC
In this query, i'm not getting distinct server_id.
Can anyone correct me this query?

Answer 1

Try
SELECT sl.server_id
  FROM system_log sl
WHERE time_log =
       (SELECT MAX(time_log) FROM system_log sl2 WHERE sl.server_id = sl2.server_id GROUP BY server_id)or
SELECT sl2.server_id
  FROM (SELECT sl.*
              ,ROW_NUMBER() over(PARTITION BY sl.server_id ORDER BY sl.time_log DESC) RN
          FROM system_log sl) sl2
WHERE sl2.rn = 1Regards...