Remove default value from a column?

Does anyone know how to remove the default value from a column?

The following script illustrates:

set long 40

drop table i;
create table i ( i varchar2(10) null);
alter table i modify ( i default null );

select column_name, nullable, data_default from user_tab_columns
where table_name = 'I'
/

drop table i;
create table i ( i varchar2(10) null);

select column_name, nullable, data_default from dba_tab_columns
where table_name = 'I'
/

The string for the default value is not a constraint. It is stored in sys.col$.default$.

There doesn't seem to be any way to remove the default value for a column once it's set. I've peruse TFM quite a bit, did a google search: nothing helpful.

Jared

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