How to remove some columns of an existing table?

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  Hello
  
  I'm working on
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  I can add a column to an existing table that already has data with below given command.
  
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  Kind regards
  John

  Add to that:

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  I have an existing table of some 30 million lines.
  
  I would like to add an additional column (I did).
  
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  Published by: 896596 on May 16, 2012 09:05

  896596 wrote:
  Greetings.

  I have an existing table of some 30 million lines.

  I would like to add an additional column (I did).

  I want to fill this new column with a sequential number.

  Have tried to create a sequence, I am at a loss on how to trigger the filling of the column.

  Any help would be received with gratitude.

  Thank you

  Published by: 896596 on May 16, 2012 09:05

  Update new_col is set nextval.seq1;.

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• Remove the column from the compressed tables

  NLSRTL	11.2.0.3.0	Production
  Oracle Database 11g Enterprise Edition	11.2.0.3.0	64 bit Production
  PL/SQL	11.2.0.3.0	Production
  AMT for Linux:	11.2.0.3.0	Production

  Hello

  I read on how to do to remove a compressed table column - first set unused and then drop unused columns. However, in the example below on the basis of data, I ran it, it does not work. Please, can you tell me WHEN this approach does not work. What is dependent on - settings or something else. Why can't I drop unused columns?

  And the example and errors:

  create table tcompressed compress in select * from all_users;

  > TCOMPRESSED table created.

  ALTER table tcompressed add x number;

  > table TCOMPRESSED altered.

  ALTER table tcompressed drop the x column;

  >

  Error report:

  SQL error: ORA-39726: unsupported operation column add/drag on compressed tables

  39726 00000 - "operation column add/drop not supported on compressed tables. ''

  * Cause: Not support add/column operation move compressed tables

  elapse.

  * Action: When adding a column, do not specify a default value.

  DELETE column is only supported in a column SET UNUSED

  (remove the column metadata).

  ALTER table tcompressed unused column of the set x;

  > table TCOMPRESSED altered.

  ALTER table tcompressed drop unused columns;

  >

  Error report:

  SQL error: ORA-39726: unsupported operation column add/drag on compressed tables

  39726 00000 - "operation column add/drop not supported on compressed tables. ''

  * Cause: Not support add/column operation move compressed tables

  elapse.

  * Action: When adding a column, do not specify a default value.

  DELETE column is only supported in a column SET UNUSED

  (remove the column metadata).

  As you can see even after changing the table defining the column as unused X I still can't drop by DROP UNUSED COLUMNS.

  Thank you.

  If you enable compression for all operations on a table, you can delete the columns in the table. If you enable compression for the only direct-path inserts, you can't remove columns.

• Add the column to an existing table-based user-defined type

  Hello guys,.
  I am compiling my function that returns a type defined by the user based on an existing table. Throughout the process of initialization so my query returns an additional column - SCORE (1). Here is my package:
  
  create or replace
  PACKAGE STAFF_AGENCY_PKG AS
  
  TYPE TYPE_SEEKER_TABLE IS TABLE OF THE DRAW. SEEKER % ROWTYPE;
  FUNCTION GET_SEEKERS (IN_KEYWORD IN VARCHAR2)
  TYPE_SEEKER_TABLE RETURN PIPELINE;
  
  END STAFF_AGENCY_PKG;
  -------
  
  create or replace
  STAFF_AGENCY_PKG PACKAGE BODY
  AS
  
  FUNCTION GET_SEEKERS (IN_KEYWORD IN VARCHAR2)
  TYPE_SEEKER_TABLE RETURN PIPELINE
  IS
  R_TBL TYPE_SEEKER_TABLE; -to return
  BEGIN
  FOR R IN)
  SELECT Seeker.SEEKER_ID,
  Seeker.FIRSTNAME,
  Seeker.LASTNAME,
  Seeker.NATIONALITY,
  Seeker.ISELIGIBLE,
  Seeker.BIRTHDATE,
  Seeker.ISRECIEVEEMAILS,
  Seeker.HIGHESTDEGREE,
  Seeker.ETHNICITY,
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  Seeker.CV,
  Seeker.PASSWORD,
  Seeker.PREFFERED_CITY,
  SEEKER. E-mail
  SEEKER. JOB_PREFERENCES_ID,
  SCORE (1)
  THE APPLICANT Seeker
  WHERE CONTAINS (CV, ' < query >)
  < textquery lang 'grammar' = 'context' = > ' |
  GET_RELATED_CATEGORIES (IN_KEYWORD) |
  ' < / textquery >
  < score datatype = "INTEGER" / >
  (< / query > ', 1) > 0
  )
  LOOP
  PIPE ROW (R); -Error (38,10): PLS-00382: expression is of the wrong type
  END LOOP;
  RETURN;
  
  END GET_SEEKERS;
  END STAFF_AGENCY_PKG;
  
  How do I change my user type to be sufficient?
  
  Oracle version 11.2.0.1.0
  Thanks in advance!

  >
  How do I change my user type to be sufficient?
  >
  You will need to create two new TYPEs. The one who has all the columns of the draw. The REQUESTOR table and the new column SCORE, then a TYPE which is an array of the first type.

  See example 12-22 using a Pipelined Table function for a Transformation in the PL/SQl language reference

  http://docs.Oracle.com/CD/B28359_01/AppDev.111/b28370/tuning.htm#i53120

  Here's the first part

  -- Define the ref cursor types and function
  CREATE OR REPLACE PACKAGE refcur_pkg IS
    TYPE refcur_t IS REF CURSOR RETURN employees%ROWTYPE;
    TYPE outrec_typ IS RECORD (
      var_num    NUMBER(6),
      var_char1  VARCHAR2(30),
      var_char2  VARCHAR2(30));
    TYPE outrecset IS TABLE OF outrec_typ;
   FUNCTION f_trans(p refcur_t)
        RETURN outrecset PIPELINED;
  END refcur_pkg;
  /
  
  CREATE OR REPLACE PACKAGE BODY refcur_pkg IS
    FUNCTION f_trans(p refcur_t)
     RETURN outrecset PIPELINED IS
      out_rec outrec_typ;
      in_rec  p%ROWTYPE;
    BEGIN
  

  Change

    TYPE outrec_typ IS RECORD (
      var_num    NUMBER(6),
      var_char1  VARCHAR2(30),
      var_char2  VARCHAR2(30));
    TYPE outrecset IS TABLE OF outrec_typ;
  

  to include all the columns you need. Unfortunately, you have to manually list all the columns in the draw. The REQUESTOR table. If you think you need this same structure in other places you must create them as SQL types instead of PL/SQL types.

  This example should be enough to show you how to modify your code to do something similar.

• inserting data in a column in an existing table

  Hi the gems...
  
  I have an existing table TABLE_1 which has more data in it. This table has no primary key. now, I added a new column 'ID' and want to make it a primary key for this table. currently it is not allowed because the column is null...
  
  so I need to insert data into the column.
  now, my plan is to fill the column with the data as well as rownumber.
  
  means that if there are 15 records in this table, then the 'ID' column should contain data from 1 to 15. After that, I'll do the column as a primary key...
  
  the script I wrote for this:
  
  declare
  number of v_rownum;
  
  Start
  Select max (rownum) in the v_rownum from TABLE_1;
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  loop
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  commit;
  end loop;
  
  end;
  
  
  
  but it refreshes only the first record and the rest of the records are not updated.
  
  Please help... Thanks in advance...

  Select max (rownum) in the v_rownum from TABLE_1;

  How many rows do you think that this query will retrieve?

  Why not just

  Update TABLE_1 t
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• Remove/hide column in a specific table header(1st row)

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