DROP column from constarints

Hi,
I need to know the command to drop columns from primary key constraints.(some columns)
Please help on this,
Thanks,

826854 wrote:
is there any other way to drop only some columns without recreating it.
just i want to know alternate , if iam wrong please ignore.
Thanks for the answer.Its there any issue you face to just drop and add new primary key in your setup i.e. you fear that volum is high and dropping and adding back would take time?

Similar Messages

  • Drop column from compressed table

    NLSRTL
    11.2.0.3.0
    Production
    Oracle Database 11g Enterprise Edition
    11.2.0.3.0
    64bit Production
    PL/SQL
    11.2.0.3.0
    Production
    TNS for Linux:
    11.2.0.3.0
    Production
    Hello,
    I read about how to drop column from a compressed table - first set it unused and then drop the unused columns. However, in the example below on the database I ran it, it does not work. Please, can you tell me WHEN this approach does not work. What it is dependent on - parameters or something else. Why I cannot drop the unused columns?
    And the example along with the errors:
    create table tcompressed compress as select * from all_users;
    > table TCOMPRESSED created.
    alter table tcompressed add x number;
    > table TCOMPRESSED altered.
    alter table tcompressed drop column x;
    >
    Error report:
    SQL Error: ORA-39726: unsupported add/drop column operation on compressed tables
    39726. 00000 -  "unsupported add/drop column operation on compressed tables"
    *Cause:    An unsupported add/drop column operation for compressed table
               was attemped.
    *Action:   When adding a column, do not specify a default value.
               DROP column is only supported in the form of SET UNUSED column
               (meta-data drop column).
    alter table tcompressed set unused column x;
    > table TCOMPRESSED altered.
    alter table tcompressed drop unused columns;
    >
    Error report:
    SQL Error: ORA-39726: unsupported add/drop column operation on compressed tables
    39726. 00000 -  "unsupported add/drop column operation on compressed tables"
    *Cause:    An unsupported add/drop column operation for compressed table
               was attemped.
    *Action:   When adding a column, do not specify a default value.
               DROP column is only supported in the form of SET UNUSED column
               (meta-data drop column).
    As you can see even after altering the table by setting the column X as unused I still cannot drop it by using DROP UNUSED COLUMNS.
    Thank you.

    check this link it might help. At the end it has also mentioned of a bug check the same.
    http://sharpcomments.com/2008/10/ora-39726-unsupported-adddrop-column-operation-on-compressed-tables.html

  • Cannot drop column from table owned by SYS

    Hello everybody,
    How can I drop a column of table which is owned by sys? thanks!
    Result as follows:
    SQL> ALTER TABLE HELLO_TB DROP COLUMN NUM;
    ALTER TABLE HELLO_TB DROP COLUMN NUM
    ERROR at line 1:
    ORA-12988: cannot drop column from table owned by SYS
    newbie v

    You can not 'change' the ownership.
    You can, however, 'move' or 'clone' most objects by exporting and importing. As follows:
    I create a table under SYS (shudder).
    I then export it
    - using userid SYS in this case,
    - under normal circumstances I'd either use a DBA account or the owner's userid
    - since I want a table, I use the TABLES option - a list is comma separated and in quotes
    I then import it using a 'userid' switch - fromuser & touser options
    - in this case from SYS to HR
    Finally, I verify it was transported.
    Actual console session in Linux follows:
    pop2@fuzzy:~> sqlplus / as sysdba
    SQL*Plus: Release 10.2.0.1.0 - Production on Fri Mar 10 19:58:01 2006
    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    Connected to:
    Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
    SQL> create table test1 ( x1 number );
    Table created.
    SQL> insert into test1 values (2);
    1 row created.
    SQL> select * from test1;
            X1
             2
    SQL> Disconnected from Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
    pop2@fuzzy:~> exp file=exp.dmp tables='TEST1'
    Export: Release 10.2.0.1.0 - Production on Fri Mar 10 20:00:07 2006
    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    Username: sys/????? as sysdba
    Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
    Export done in AL32UTF8 character set and AL16UTF16 NCHAR character set
    About to export specified tables via Conventional Path ...
    . . exporting table                          TEST1          1 rows exported
    Export terminated successfully without warnings.
    pop2@fuzzy:~> imp file=exp.dmp fromuser=sys touser=hr
    Import: Release 10.2.0.1.0 - Production on Fri Mar 10 20:00:44 2006
    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    Username: sys/????? as sysdba
    Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
    Export file created by EXPORT:V10.02.01 via conventional path
    import done in AL32UTF8 character set and AL16UTF16 NCHAR character set
    . importing SYS's objects into HR
    . . importing table                        "TEST1"          1 rows imported
    Import terminated successfully without warnings.
    pop2@fuzzy:~> sqlplus hr/hr
    SQL*Plus: Release 10.2.0.1.0 - Production on Fri Mar 10 20:00:57 2006
    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    Connected to:
    Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
    SQL> select * from test1;
            X1
             2
    SQL>The export/import pair are incredibly powerful - and few people understand them well. If you are interested in digging into their capability, check out their chapters in the Utilities manual (under the Books tab) at http://www.oracle.com/pls/db102/portal.portal_db?selected=1

  • Error in Dropping columns from Subject Area to selected Columns section

    While Dropping columns from Subject Area to selected Columns section in Analytics nothing is happening.There is no error in the RPD.I am using OBIEE 11g and windows7.I am also getting page error like below:
    Webpage error details
    User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)
    Timestamp: Tue, 4 Sep 2012 08:31:07 UTC
    Message: 'kmsgPickerUIJSCantAddColumns' is undefined
    Line: 1
    Char: 1781
    Code: 0
    URI: http://localhost:7001/analytics/res/b_mozilla/picker.js
    Message: 'kmsgPickerUIJSCantAddColumns' is undefined
    Line: 1
    Char: 1781
    Code: 0
    URI: http://localhost:7001/analytics/res/b_mozilla/picker.js
    Can you guys please help?

    That error usually means it is still mapped, maybe it is used in another interface if you say the mapping has definitely been removed.
    You can expand the datastore > Used In > "As a Target" or "As a Source" or "In a Package" - that should tell you if it being used anywhere else.
    Cheers
    John
    http://john-goodwin.blogspot.com/

  • HOWTO drop column from Designer instead of warning

    Hi,
    is there possibility to tell designer to generate scripts for dropping columns that are no longer in repository? I'm using Designer 6i.
    Thank you,
    Radek

    This functionality is not available in Designer at this point. The decision not to drop the column was in order to try to preserve data integrity.
    However, as the database now allows you to do this, we have decided to add this functionality to Designer. In the short term you will need to
    update your DDL scripts manually, but we hope to bring you this functionality automatically from Designer by the end
    of this calendar year or early next year in a maintenance release.
    Regards
    Sue Harper

  • Drop column from compressed partitioned table

    Hi,
    DB version is 11.2.02.
    We have table which is range partitioned and sub-partitioned by list.
    Table is also compressed.
    When I try to drop a column, I get error.
    CREATE TABLE DWH_REP.P_RATING (
      id_source$                 NUMBER(38,0)  NULL,
      time_insert$               DATE          ,
      time_update$               DATE          ,
      FLG_CURRENT$               NUMBER(38,0)  ,
      FLG_CHANGED$               NUMBER(38,0)  ,
      id_audit$                  NUMBER(38,0)  ,
      ID_DATE_PSTING             NUMBER(38,0)  ,
      partner_rating_id          VARCHAR2(256) ,
      partner_id                 VARCHAR2(256) ,
      id_partner                 NUMBER(38,0)  , 
      rating_system_id           VARCHAR2(256) ,
      rating_id                  VARCHAR2(256) ,
      date_rating                DATE          ,
      date_follow_up             DATE          ,
      risk_team_id               VARCHAR2(256) ,
      risk_team_descr            VARCHAR2(256) ,
      risk_team_changed_id       VARCHAR2(256) ,
      risk_team_changed_descr    VARCHAR2(256) ,
      date_risk_team_changed     DATE          ,
      assignment_id              VARCHAR2(256) ,
      date_assignment            DATE          ,
      date_assignment_confirmed  DATE          ,
      date_assignment_expiration DATE          ,
      flg_exception              VARCHAR2(256) ,
      exception_id               VARCHAR2(256) ,
      date_exception             DATE         
    -- TABLESPACE DWH_REP_DATA
    PARTITION BY RANGE (FLG_CURRENT$, ID_DATE_PSTING)
       SUBPARTITION BY LIST (ID_SOURCE$)
       (PARTITION P_RATING_2010               
           VALUES LESS THAN (0, 20110101)
           SUBPARTITION P_RATING_2010_UCS VALUES  (10) TABLESPACE DWH_O_2010_TBS,
           SUBPARTITION P_RATING_2010_UCM VALUES (11) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_ORBI30 VALUES  (30) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_ORBI31 VALUES  (31) TABLESPACE DWH_O_2010_TBS,
           SUBPARTITION P_RATING_2010_CETELEM VALUES  (40) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_MILES VALUES  (60) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_BHI VALUES  (80) TABLESPACE DWH_O_2010_TBS,
           SUBPARTITION P_RATING_2010_DF VALUES  (DEFAULT) TABLESPACE DWH_O_2010_TBS),   
         PARTITION P_RATING_2011            
           VALUES LESS THAN (0, 20120101)
           SUBPARTITION P_RATING_2011_UCS VALUES (10) TABLESPACE DWH_O_2011_TBS,
           SUBPARTITION P_RATING_2011_UCM VALUES (11) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_ORBI30 VALUES (30) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_ORBI31 VALUES (31) TABLESPACE DWH_O_2011_TBS,
           SUBPARTITION P_RATING_2011_CETELEM VALUES (40) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_MILES VALUES (60) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_BHI VALUES (80) TABLESPACE DWH_O_2011_TBS,
           SUBPARTITION P_RATING_2011_DF VALUES (DEFAULT) TABLESPACE DWH_O_2011_TBS),
        PARTITION P_RATING_current           
           VALUES LESS THAN (maxvalue, maxvalue)
           SUBPARTITION P_RATING_CUR_UCS VALUES (10) TABLESPACE DWH_O_CRT_UCS_TBS,
           SUBPARTITION P_RATING_CUR_UCM VALUES (11) TABLESPACE DWH_O_CRT_UPM_TBS,
    --     SUBPARTITION P_RATING_CUR_ORBI30 VALUES (30) TABLESPACE DWH_O_CRT_ORBI30_TBS,
    --     SUBPARTITION P_RATING_CUR_ORBI31 VALUES (31) TABLESPACE DWH_O_CRT_ORBI31_TBS,
           SUBPARTITION P_RATING_CUR_CETELEM VALUES (40) TABLESPACE DWH_O_CRT_CETELEM_TBS,
    --     SUBPARTITION P_RATING_CUR_MILES VALUES (60) TABLESPACE DWH_O_CRT_MILES_TBS,
    --     SUBPARTITION P_RATING_CUR_BHI VALUES (80) TABLESPACE DWH_O_CRT_BHI_TBS,
           SUBPARTITION P_RATING_CUR_DF VALUES (DEFAULT) TABLESPACE DWH_O_CRT_DF_TBS))
    ENABLE ROW MOVEMENT
    NOLOGGING
    COMPRESS
    NOCACHE
    NOPARALLEL
    MONITORING;
    ALTER TABLE DWH_REP.P_RATING DROP COLUMN ID_PARTNER;
    ORA-39726: unsupported add/drop column operation on compressed tables

    littleboy wrote:
    Hi,
    DB version is 11.2.02.
    We have table which is range partitioned and sub-partitioned by list.
    Table is also compressed.
    When I try to drop a column, I get error.
    CREATE TABLE DWH_REP.P_RATING (
    id_source$                 NUMBER(38,0)  NULL,
    time_insert$               DATE          ,
    time_update$               DATE          ,
    FLG_CURRENT$               NUMBER(38,0)  ,
    FLG_CHANGED$               NUMBER(38,0)  ,
    id_audit$                  NUMBER(38,0)  ,
    ID_DATE_PSTING             NUMBER(38,0)  ,
    partner_rating_id          VARCHAR2(256) ,
    partner_id                 VARCHAR2(256) ,
    id_partner                 NUMBER(38,0)  , 
    rating_system_id           VARCHAR2(256) ,
    rating_id                  VARCHAR2(256) ,
    date_rating                DATE          ,
    date_follow_up             DATE          ,
    risk_team_id               VARCHAR2(256) ,
    risk_team_descr            VARCHAR2(256) ,
    risk_team_changed_id       VARCHAR2(256) ,
    risk_team_changed_descr    VARCHAR2(256) ,
    date_risk_team_changed     DATE          ,
    assignment_id              VARCHAR2(256) ,
    date_assignment            DATE          ,
    date_assignment_confirmed  DATE          ,
    date_assignment_expiration DATE          ,
    flg_exception              VARCHAR2(256) ,
    exception_id               VARCHAR2(256) ,
    date_exception             DATE         
    -- TABLESPACE DWH_REP_DATA
    PARTITION BY RANGE (FLG_CURRENT$, ID_DATE_PSTING)
    SUBPARTITION BY LIST (ID_SOURCE$)
    (PARTITION P_RATING_2010               
    VALUES LESS THAN (0, 20110101)
    SUBPARTITION P_RATING_2010_UCS VALUES  (10) TABLESPACE DWH_O_2010_TBS,
    SUBPARTITION P_RATING_2010_UCM VALUES (11) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_ORBI30 VALUES  (30) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_ORBI31 VALUES  (31) TABLESPACE DWH_O_2010_TBS,
    SUBPARTITION P_RATING_2010_CETELEM VALUES  (40) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_MILES VALUES  (60) TABLESPACE DWH_O_2010_TBS,
    --     SUBPARTITION P_RATING_2010_BHI VALUES  (80) TABLESPACE DWH_O_2010_TBS,
    SUBPARTITION P_RATING_2010_DF VALUES  (DEFAULT) TABLESPACE DWH_O_2010_TBS),   
    PARTITION P_RATING_2011            
    VALUES LESS THAN (0, 20120101)
    SUBPARTITION P_RATING_2011_UCS VALUES (10) TABLESPACE DWH_O_2011_TBS,
    SUBPARTITION P_RATING_2011_UCM VALUES (11) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_ORBI30 VALUES (30) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_ORBI31 VALUES (31) TABLESPACE DWH_O_2011_TBS,
    SUBPARTITION P_RATING_2011_CETELEM VALUES (40) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_MILES VALUES (60) TABLESPACE DWH_O_2011_TBS,
    --     SUBPARTITION P_RATING_2011_BHI VALUES (80) TABLESPACE DWH_O_2011_TBS,
    SUBPARTITION P_RATING_2011_DF VALUES (DEFAULT) TABLESPACE DWH_O_2011_TBS),
    PARTITION P_RATING_current           
    VALUES LESS THAN (maxvalue, maxvalue)
    SUBPARTITION P_RATING_CUR_UCS VALUES (10) TABLESPACE DWH_O_CRT_UCS_TBS,
    SUBPARTITION P_RATING_CUR_UCM VALUES (11) TABLESPACE DWH_O_CRT_UPM_TBS,
    --     SUBPARTITION P_RATING_CUR_ORBI30 VALUES (30) TABLESPACE DWH_O_CRT_ORBI30_TBS,
    --     SUBPARTITION P_RATING_CUR_ORBI31 VALUES (31) TABLESPACE DWH_O_CRT_ORBI31_TBS,
    SUBPARTITION P_RATING_CUR_CETELEM VALUES (40) TABLESPACE DWH_O_CRT_CETELEM_TBS,
    --     SUBPARTITION P_RATING_CUR_MILES VALUES (60) TABLESPACE DWH_O_CRT_MILES_TBS,
    --     SUBPARTITION P_RATING_CUR_BHI VALUES (80) TABLESPACE DWH_O_CRT_BHI_TBS,
    SUBPARTITION P_RATING_CUR_DF VALUES (DEFAULT) TABLESPACE DWH_O_CRT_DF_TBS))
    ENABLE ROW MOVEMENT
    NOLOGGING
    COMPRESS
    NOCACHE
    NOPARALLEL
    MONITORING;
    ALTER TABLE DWH_REP.P_RATING DROP COLUMN ID_PARTNER;
    ORA-39726: unsupported add/drop column operation on compressed tables
    can you checkwith following?
    SQL>alter table t set unused column x;
    SQL>alter table t drop unused columns;Tom explains it ->http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:69076630635645

  • Alter table tablename drop column col

    I tried to drop a column from a table created by sys user. Being a sys user I am unable to drop the column. Please explain.
    SQL> alter table test move tablespace users;
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    SQL> alter table test drop column two;
    alter table test drop column two
    ERROR at line 1:
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    Here two is the column name.
    Regards
    Vijay Kumar

    Hello Gasparotto
    It is amazing to me. Being a sys user I created a table and then I tried to alter the table by dropping a column but it is giving me error as I have already stated. Please explain over this issue.
    Regards
    Vijay Kumar

  • Drop Columns

    I have an Oracle table with 60million records in it. I have about 35 columns in it and it takes about 40GB of tablespace in the database. I would like to drop some columns to reduce the table size (& also to reduce tablespace usage). Am using Oracle 9i and tried the drop column command. I get the ORA-30036 unable to extend the segment by 8192 in undo tablespace 'UNDOTBS1'. How to I overcome this issue? Is there any effecient way to drop columns from such a large table? Please advise

    >>Actually after we 've made column UNUSED, we lost it.
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  • Dropping unused columns from database table

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    Thanks in advance.
    Kam

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    Sorry for late response. Got stuck in work.
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  • Shutdown hangs after drop column

    Hi,
    We were trying to drop column on a very big table, after that we cancelled that operation, and given shutdown immediate command.
    Now shutdown is taking too much time, going on from last 9 hours.....
    We want to start the database, what can be the best possible solution.
    Shutdown abort and startup will help ?
    Thanks
    Dilipkumar Patel.

    We were trying to drop column on a very big table, after that we cancelled that operation, and given shutdown immediate command.I guess SMON was doing rollback the transaction when you cancelled the operation. Since it was a big table, it was taking lot of time.
    Can you check the alter log is there any error or info msg in it?
    I am afraid if you give shutdown abort, may cause serious issues.
    Before you execute 'shutdown abort', make sure you have good backup, in case of recovery.
    Jaffar

  • How to remove some columns from an existing table?

    Let's say my table's structure is as follows:
    Table name: EMPLOYEE
    Columns: Name, Birthdate, Gender, Salary, Hometown, Language and so on.
    There are data in the table. Now I want to remove columns Hometown and Language, and I don't care the data loss. Also, there is no constraint.
    What's the sql command to do this? Thanks!

    I think you need to be a bit more specific than stating that something is not correct.
    It is perfectly correct and proper to drop a column from a table even when there is data. The problem comes when you need to drop a column and the window you have to perform the expensive operation of actually reclaiming the disk space is insufficient. If that is the case (and there is no indication from the original poster that is the case, but it's certainly conceivable), it may make sense to mark the column as unused, which is a quick update to the data dictionary and then drop the unused columns at a later date when you have a larger window. This is incredibly useful in a handful of larger systems, but not particularly necessary in most systems most of the time. It wouldn't make sense to mark a column unused and then immediately drop the column.
    If you are going to go the SET UNUSED route, your syntax is incorrect. Once you mark the column unused, you can't drop the column by name any longer (since you can add a column with the unused column's old name, it's also potentially rather dangerous). You have to use the DROP UNUSED COLUMNS clause
    SQL> desc x;
    Name                                      Null?    Type
    COL1                                      NOT NULL NUMBER
    COL2                                               NUMBER
    SQL> alter table x set unused column col2;
    Table altered.
    SQL> alter table x drop column col2;
    alter table x drop column col2
    ERROR at line 1:
    ORA-00904: "COL2": invalid identifier
    SQL> alter table x drop unused columns;
    Table altered.Justin

  • Dealing with errors due to newly added/dropped columns

    DB version:11g
    I am not sure if i have created an unnecessarily large post to explain a simple issue. Anway, here it is.
    I have been asked to code a package for Archiving .
    We'll have two schemas;The original schema and an Archive schema (connected via a DB Link)
    ORIGINAL Schema -------------------------> ARCHIVE Schema
                   via DB Link          When records of certain tables in the ORIGINAL schema meet the archiving criteria (based on Number of Days Old, Status Code etc), it will be moved ('archived') to the ARCHIVE schema using the INSERT syntax
    insert into arch_original@dblink
    col1,
    col2,
    col3,
    select col1,
    col2,
    col3,
    from original_tableThe original table and its archive table has the same structure, except that the Archive table has an additional column called archived_date which just records when a record got archived.
    create table original
    col1 varchar2(33),
    col2 varchar2(35),
    empid number
    create table arch_original
    col1 varchar2(33),
    col2 varchar2(35),
    empid number,
    archived_date date default sysdate not null
    );We have tables with lots of columns(there are lots of tables with more than 100 columns) and when all column names are explicitly listed like the above syntax, the code becomes huge.
    Alternative Syntax:
    So i thougt of using the syntax
    insert into arch_original select original.*,sysdate from original;  -- sysdate will populate archived_date columnEventhough the code looks simple and short, i've noticed a drawback to this approach.
    Drawback:
    For the next release, if developers decide to add/drop a column in the ORIGINAL table in the Original Schema, that change should be reflected in the archive_table's (ARCHIVE schema) DDL script as well. It is practically impossible to keep track of all these changes during the development phase.
    If i use
    insert into arch_original select original.*,sysdate from original;  syntax, you will realise that there is change in the table structure only when you encounter an error(due to missing/new column) in the Runtime. But, if you have all the column names listed explicitly like
    insert into arch_original@dblink
    (col1,
    col2,
    col3,
    select col1,
    col2,
    col3,
    from original_tablethen you'll encounter this error during the Compilation itself. I prefer the error due to a missing/new column during the Compilation itself rather than in Runtime.
    So what do you guys think? I shouldn't go for
    insert into arch_original select original.*,sysdate from original; syntax because of the above Drawback. Right?

    What advantage would it bring if i make ARCHIVED_DATE as the first column in the ARCHIVE tables?The advantage is that if you'll add a column in the future on both original and archived tables the insert statement will work anyway...
    SQL> create table x (a number, b number);
    Table created.
    SQL> create table y (arc_date date, a number, b number);
    Table created.
    SQL> insert into x values (1,1);
    1 row created.
    SQL> insert into x values (2,2);
    1 row created.
    SQL> select * from x;
             A          B
             1          1
             2          2
    SQL> insert into y select sysdate, x.* from x;
    2 rows created.
    SQL> alter table x add (c number);
    Table altered.
    SQL> alter table y add (c number);
    Table altered.
    SQL> alter table x drop column b;
    Table altered.
    SQL> alter table y drop column b;
    Table altered.
    SQL> insert into x values (3,3);
    1 row created.
    SQL> insert into y select sysdate, x.* from x
      2  where a=3;
    1 row created.
    SQL> select * from x;
             A          C
             1
             2
             3          3
    SQL> select * from y;
    ARC_DATE           A          C
    25-JAN-10          1
    25-JAN-10          2
    25-JAN-10          3          3Max
    [My Italian Oracle blog|http://oracleitalia.wordpress.com/2010/01/23/la-forza-del-foglio-di-calcolo-in-una-query-la-clausola-model/]
    Edited by: Massimo Ruocchio on Jan 25, 2010 12:44 PM
    Added more explicative example

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