Dropping a column's default value

How to drop a column's default value?
The following commands fails:
ALTER TABLE t1 ALTER COLUMN c1 DROP DEFAULT.
ALTER TABLE t1 MODIFY c1 DROP DEFAULT.
Thanks in advance.

SQL> ALTER TABLE IDENTIFICADORES_DOMINIOS_RANGO MODIFY TIPO_DATO DEFAULT NULL;
Table altered
SQL> DESC IDENTIFICADORES_DOMINIOS_RANGO
Name                 Type         Nullable Default Comments
CODIGO_IDENTIFICADOR NUMBER(7)
DESCRIPCION          VARCHAR2(50)
TIPO                 VARCHAR2(1)
TIPO_DATO            VARCHAR2(1)           NULL    Tipo de dato que contiene el Dominio-RangoI would like drop DEFAULT value; now, it's marked like NULL. It's not the same... is it?

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Mein Tuhade liye eh example try kita hai.
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SQL> SQL> create table orders (
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2 3 4 5
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DEPT PLACE INTCOL
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HR LA 12
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IT HALIFAX 5
exp simar/simar@RACDB file=exptest.dmp log=exptest.log
rac01:/software/backup>exptest.dmp log=exptest.log <
Export: Release 10.2.0.3.0 - Production on Tue May 6 23:35:58 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
Export done in WE8ISO8859P1 character set and AL16UTF16 NCHAR character set
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user SIMAR
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user SIMAR
About to export SIMAR's objects ...
. exporting database links
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. . exporting table ABC 12 rows exported
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. exporting stored procedures
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rac01:/software/backup>strings exptest.dmp |grep -i 'create'
CREATE TABLE "ABC" ("A" VARCHAR2(10), "B" VARCHAR2(10)) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS
CREATE TABLE "ORDERS" ("DEPT" VARCHAR2(20), "PLACE" VARCHAR2(20), "INTCOL" NUMBER(*,0)) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS
rac01:/software/backup>strings exptest.dmp |grep -i 'alter'
ALTER TABLE "ORDERS" MODIFY DEFAULT
ALTER TABLE "ORDERS" MODIFY ("INTCOL" DEFAULT 12
ALTER TABLE "ORDERS" ADD PRIMARY KEY ("DEPT") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING ENABLE
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SQL> drop table orders;
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imp simar/simar@RACDB file=exptest.dmp log=imp_exptest_1.log tables='ORDERS'
rac01:/software/backup>exptest.dmp log=imp_exptest_1.log tables='ORDERS' <
Import: Release 10.2.0.3.0 - Production on Tue May 6 23:46:48 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
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. importing SIMAR's objects into SIMAR
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Import terminated successfully without warnings.
SQL> conn / as sysdba
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SQL> set heading off;
set echo off;
Set pages 999;
set long 90000;
SQL> SQL> SQL> SQL> SQL>
SQL> select dbms_metadata.get_ddl('TABLE','ORDERS','SIMAR') from dual;
CREATE TABLE "SIMAR"."ORDERS"
( "DEPT" VARCHAR2(20),
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PRIMARY KEY ("DEPT")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
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STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
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SQL>
Here the alter table statement is in the dmp file as well as in the imported table.
Regards

Dropping a column's default value

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