[Solved] I used RANGE UNBOUNDED FOLLOWING. But syntax error

Question

http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14200/functions001.htm#CIHCEIGA
RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING. The short form of this is RANGE UNBOUNDED FOLLOWINGI used RANGE UNBOUNDED FOLLOWING.
But I got syntax error ORA-00905: missing keyword.
Why?
SQL> select version from v$instance;
VERSION
10.2.0.1.0
SQL> select Val,
  2  First_Value(case when mod(Val,10) = 0 then Val end ignore nulls)
  3  over(order by Val Range Between Current row and Unbounded Following)
  4  as "aaa"
  5  from (select 10 as Val from dual
  6  union select 15 from dual
  7  union select 20 from dual
  8  union select 25 from dual
  9  union select 30 from dual
10  union select 32 from dual
11  union select 34 from dual
12  union select 40 from dual);
VAL  aaa
10   10
15   20
20   20
25   30
30   30
32   40
34   40
40   40
SQL> select Val,
  2  First_Value(case when mod(Val,10) = 0 then Val end ignore nulls)
  3  over(order by Val Range Unbounded Following)
  4  as "aaa"
  5  from (select 10 as Val from dual
  6  union select 15 from dual
  7  union select 20 from dual
  8  union select 25 from dual
  9  union select 30 from dual
10  union select 32 from dual
11  union select 34 from dual
12  union select 40 from dual);
over(order by Val Range Unbounded Following)
ORA-00905: missing keyword.

Answer 1

Thanks for doc link and reply.
I saw doc page 217 of the DB2 Version 9 doc.
Well.
On "window-aggregation-group-clause", we can choose "ROWS" and "group-end".
Then on "group-end", we can choose "UNBOUNDED FOLLOWING" or "unsigned-constant FOLLOWING".
On DB2 V9.1, I tested this query.
Then, this query worked.
select sortKey,Val,
max(Val) over(order by sortKey Range Unbounded Following) as MaxVal1,
max(Val) over(order by sortKey Rows 2 following) as MaxVal2
from (select 10 as sortKey,90 as Val from sysibm.sysdummy1
union select 20 as sortKey,50 as Val from sysibm.sysdummy1
union select 30 as sortKey,70 as Val from sysibm.sysdummy1
union select 40 as sortKey,30 as Val from sysibm.sysdummy1
union select 50 as sortKey,95 as Val from sysibm.sysdummy1
union select 60 as sortKey,98 as Val from sysibm.sysdummy1) dummy
sortKey  Val  MaxVal1  MaxVal2
     10   90       98       90
     20   50       98       70
     30   70       98       95
     40   30       98       98
     50   95       98       98
     60   98       98       98I saw doc page 219-220 of the DB2 Version 9 doc.
In doc page 219-220
group-end
Specifies the ending point for the aggregation group. The aggregation
group start is the current row.
Specification of the group-end clause is equivalent to a group-between clause of the form ″BETWEEN CURRENT ROW AND group-end″.Therefore,
I conclude that "UNBOUNDED FOLLOWING" is official on DB2.
However I don't know that "UNBOUNDED FOLLOWING" is official on standard SQL.