Query about min and max and middle row of a table

Question

suppose i have table emp and field
v_date date;
which has data in time stamp
time
10:20
10:25
10:30
10:32
10:33
10:35
10:36
10:38
I need only min time and max time and two record between min and max

Answer 1

I need only min time and max time and two record between min and max Like this?
SQL> create table t (id number);
Table created.
SQL>
SQL> insert into t values (1020);
1 row created.
SQL> insert into t values (1025);
1 row created.
SQL> insert into t values (1030);
1 row created.
SQL> insert into t values (1032);
1 row created.
SQL> insert into t values (1033);
1 row created.
SQL> insert into t values (1035);
1 row created.
SQL> insert into t values (1036);
1 row created.
SQL> insert into t values (1038);
1 row created.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> select * from t;
     ID
   1020
   1025
   1030
   1032
   1033
   1035
   1036
   1038
8 rows selected.
SQL>
SQL>
SQL> select decode(rownum, 1, min_val, 4, max_val, next_val) your_data from (
  2  select first_value (id) over (partition by 'a' order by 'a') min_val,
  3         last_value (id) over (partition by 'a' order by 'a')  max_val,
  4         id,
  5         lead(id) over (partition by 'a' order by id) next_val
  6   from t
  7  order by id
  8   )
  9  where min_val <> next_val and max_val <> next_val
10  and rownum <= 4;
YOUR_DATA
     1020
     1030
     1032
     1038
SQL>