Selecting multiple max values

Question

Hi everyone,
I need you help in preparing a query
So I have a table that looks like this
ID Time
1 10
1 11
2 12
2 13
1 14
3 15
3 16
And I need to get for each ID it's minimal time and and then maximal time that is less that minimal for this ID
So it would look like this
ID TimeMin TimeMax
1 10 -
2 12 11
3 15 14
Please help me with that!

Answer 1

Solomon Yakobson wrote:
chris227 wrote:
Which one is more efficient?SORT PUSHED RANK is more efficient since it provides top n query optimization.I doubt that this is always the case, may be the difference is meaningless.
create table data as (
select length(object_name) id, rownum time 
from all_objects
where rownum < 10001
select
  id
, min(time) timemin
, min(lt) keep (dense_rank first order by lt nulls first) timemax
from (
  select
    id
  , time
  , lag(time) over (order by time) lt
  from data
group by
id
Operation Options Object Rows Time Cost Bytes
SELECT STATEMENT     10,000 1 13 390,000    
SORT GROUP BY   10,000 1 13 390,000    
VIEW     10,000 1 10 390,000    
WINDOW SORT   10,000 1 10 260,000    
TABLE ACCESS FULL DATA 10,000 1 7 260,000
select  id,
        time timemin,
        lt   timemax
  from  (
         select  id,
                 time,
                 lag(time) over (order by time) lt,
                 row_number() over (partition by id order by time) rn
           from  data
  where rn = 1
Operation Options Object Rows Time Cost Bytes Filter Predicates * Access Predicates
SELECT STATEMENT     10,000 1 13 520,000    
VIEW     10,000 1 13 520,000 "RN" = 1  
WINDOW SORT PUSHED RANK   10,000 1 13 260,000 ROW_NUMBER() OVER ( PARTITION BY "ID" ORDER BY "TIME")< = 1  
WINDOW SORT   10,000 1 13 260,000    
TABLE ACCESS FULL DATA 10,000 1 7 260,000 see also http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:122801500346829407 for a similar example.
Regards