VSN NOT NULL issue with 11g

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• Please let me know how I can add a new column with a constraint not null, table already has data, without falling off the table... Please help me on this issue...

  Hello

  I have an emp_job_det with a, b, c columns table. Note that this TABLE ALREADY has DATA OF THESE COLUMNS

  IAM now add a new column "D" with forced not null

  Fistly I alter the table by adding the single column "D", if I do, the entire column would be created with alll of nulls for the column DEFAULT D

  ALTER table emp_job_det Add number D; -do note not null CONSTRAINT is not added

  Second... If I try to add the constraint not null, get an eoor as already conatained null values...

  (GOLD)

  In other words, if I put the query

  ALTER table emp_job_det Add number D NOT NULL; -THROWS ERROR AS TABLE ALREADY CONTAINS DATA

  So my question is how how can I add a new column with a constraint not null, table already has the data, without falling off the table

  Please help me on this issue...

  Add the column without constraint, then fill the column. Once all the rows in the table are given in the new column, and then add the constraint not null.

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• Fill with the previous 'not null' value ' Null' known values

  Hi all

  I have the following requirement to fill in missing values (null values) with the "Not null" values known previously available.

  Source of the example:

  Emp_Id	Start_Dt	LOC	Comm	Grade
  A101	01/01/2013	NJ	4000	B
  A101	15/03/2013	CA	4800
  A101

  15/05/2013

  3500C

  A101

  25/07/2013

  2500

  A101

  20/12/2013

  NY5800A

  A101

  14/02/2013

  5000

  A101

  20/05/2014

  DC6000A

  A101

  03/06/2014

  3600C

  A102

  24/05/2013

  THE5000A

  A102

  15/12/20134300

  Expected results values in columns LOC and grades:

  Emp_Id	Start_Dt	LOC	Comm	Grade
  A101	01/01/2013

  NJ4000BA101

  15/03/2013

  CA4800BA101

  15/05/2013

  CA3500CA101

  25/07/2013

  CA2500CA101

  20/12/2013

  NY5800AA101

  14/02/2013

  NY5000AA101

  20/05/2014

  DC6000AA101

  03/06/2014

  DC3600CA102

  24/05/2013

  THE5000AA102

  15/12/2013

  THE4300A

  Any suggestions would be helpful.

  Kind regards

  Arun

  Also, I think that this is a case of analytics. Last_value is perhaps the most appropriate function for the given task:

  Select emp_id

  start_dt

  last_value(loc ignore nulls) over (partition by emp_id arrested by start_dt) loc

  comm

  last_value(grade ignore nulls) about category (partition by emp_id arrested by start_dt)

  t

• Adding a column with constriant not null

  Hello
  
  How to add a column to the story with the data and put a constriant not null for her.
  Can someone please let know.
  
  Thank you

  If you want to avoid the audit of the nullity of this column, existing values that use:

  alter table t1 modify emp_key not null novalidate;
  

• What is the difference between primary key and unique indexes with forced not null?

  Primary key is = unique index + not null?

  The short answer is Yes.

  However, even if the primary key, applying both uniquness and not null, there is a notion of "special".

  You can only have one primary key in tables, but you can have multiple unique indexes and constraints not null.

  See: https://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:8743855576462

• Listagg works does not in mview with fast refresh on commit?

  Version Info:

  Oracle Database 11 g Release 11.2.0.3.0 - 64 bit Production

  PL/SQL Release 11.2.0.3.0 - Production

  CORE Production 11.2.0.3.0

  AMT for 64-bit Windows: Version 11.2.0.3.0 - Production

  NLSRTL Version 11.2.0.3.0 - Production

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  Thank you!

  -Tom

  Test scenario follows...

  SQL> create table codes (
    2       id number primary key,
    3       product varchar2(10) not null,
    4       code varchar2(10) not null);
  
  Table created.
  
  SQL> create materialized view log on codes with rowid, sequence (product, code) including new values;
  
  Materialized view log created.
  
  SQL> create materialized view code_agg_mv
    2        refresh fast on commit
    3        with rowid
    4        as
    5  select c.product
    6        , listagg(c.code, ',') within group (order by c.code) codes
    7        , count(*) cnt
    8    from codes c
    9   group by c.product;
  
  Materialized view created.
  
  SQL> truncate table mv_capabilities_table;
  
  Table truncated.
  
  SQL> begin
    2       dbms_mview.explain_mview('CODE_AGG_MV');
    3       commit;
    4  end;
    5  /
  
  PL/SQL procedure successfully completed.
  
  SQL> select capability_name, possible
    2    from mv_capabilities_table
    3   where capability_name like '%REFRESH%'
    4   order by capability_name;
  
  CAPABILITY_NAME                P
  ------------------------------ -
  REFRESH_COMPLETE               Y
  REFRESH_FAST                   Y
  REFRESH_FAST_AFTER_ANY_DML     Y
  REFRESH_FAST_AFTER_INSERT      Y
  REFRESH_FAST_AFTER_ONETAB_DML  Y
  REFRESH_FAST_PCT               N
  
  6 rows selected.
  
  SQL> insert into codes (id, product, code) values (1, 'Pants', 'Large');
  
  1 row created.
  
  SQL> insert into codes (id, product, code) values (2, 'Pants', 'Blue');
  
  1 row created.
  
  SQL> insert into codes (id, product, code) values (3, 'Pants', 'Itchy');
  
  1 row created.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> select *
    2    from code_agg_mv;
  
  PRODUCT    CODES                                 CNT
  ---------- ------------------------------ ----------
  Pants      Blue,Itchy,Large                        3
  
  SQL> -- ^^^ This is correct ^^^
  
  SQL> delete from codes where id = 3;
  
  1 row deleted.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> select * from code_agg_mv;
  
  PRODUCT    CODES                                 CNT
  ---------- ------------------------------ ----------
  Pants      Blue,Itchy,Large                        2
  
  SQL> -- ^^^ CNT is correct, but codes should not contain "Itchy" ^^^
  SQL> --
  SQL> -- Try an explicit fast refresh...
  
  SQL> begin
    2       dbms_mview.refresh('CODE_AGG_MV', 'F');
    3  end;
    4  /
  
  PL/SQL procedure successfully completed.
  
  SQL> select * from code_agg_mv;
  
  PRODUCT    CODES                                 CNT
  ---------- ------------------------------ ----------
  Pants      Blue,Itchy,Large                        2
  
  SQL> -- ^^^ Nope, same issue. ^^^
  SQL> --
  SQL> -- Try an explicit complete refresh...
  
  SQL> begin
    2       dbms_mview.refresh('CODE_AGG_MV', 'C');
    3  end;
    4  /
  
  PL/SQL procedure successfully completed.
  
  SQL> select * from code_agg_mv;
  
  PRODUCT    CODES                                 CNT
  ---------- ------------------------------ ----------
  Pants      Blue,Large                              2
  
  SQL> -- ^^^ There we go. ^^^
  
  

  Message edited by Tom N to include database version information.

  Hello Tom,

  listagg() is not supported for fast refresh.

  http://docs.Oracle.com/CD/E11882_01/server.112/e25554/basicmv.htm#i1007028

  Only SUM, COUNT, AVG, STDDEV, VARIANCE, MIN and MAX are supported to fast refresh.

  Kind regards

  Pravin

• Hide and show region - open if Item not Null

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• Virtual column NOT NULL

  Hello dear colleagues,
  
  Anyone able to replicate this?

  BANNER
  --------------------------------------------------------------------------------
  Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
  PL/SQL Release 11.2.0.1.0 - Production
  CORE    11.2.0.1.0      Production
  TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
  NLSRTL Version 11.2.0.1.0 - Production

  Create a small table:

  SQL> create table t(x number not null);
  
  Table created.

  Now, add a virtual column, using decode:

  SQL> alter table t add (y varchar2(1) as (decode(x, 1, 'A', 'B')) not null);
  
  Table altered.

  'The same', using case column

  SQL> alter table t add (z varchar2(1) as (case x when 1 then 'A' else 'B' end));
  
  Table altered.

  Only it wasn't the same, I wanted to NOT NULL.
  If I do, I get:

  SQL> alter table t add (w varchar2(1) as (case x when 2 then 'A' else 'B' end) not null);
  alter table t add (w varchar2(1) as (case x when 2 then 'A' else 'B' end) not null)
                                                                   *
  ERROR at line 1:
  ORA-03113: EOF pÕ kommunikationskanal
  Process ID: 3400
  Session ID: 140 Serial number: 213

  This is consistent with this database on my laptop.
  
  
  Concerning
  Peter

  Looks like you have perhaps hit Bug Bug 9277263: ORA-07445 [ATBNUL () + 299] WHEN ADDING a CONSTRAINT INLINE ON a VIRTUAL COLUMN

• Is it possible to remove the NOT NULL to a non-key column constraint?

  Oracle version: Enterprise Edition 11g - 11.2.0.1.0
  OS: Redhat Linux Enterprise Edition 5.0
  
  
  
  Hi all
  
  
  I have a question on the NON NULL columns in oracle tables and I would be grateful if you could kindly help me with this problem well.
  
  I have the following table

  CREATE TABLE ARTICLES
  (
      artid                VARCHAR2(20),
      lbl                  VARCHAR2(100)        NOT NULL,
      cmporder             VARCHAR2(30)         NOT NULL      
  )
  
  ALTER TABLE ARTICLES ADD CONSTRAINT PK_ARTICLES PRIMARY KEY(artid);

  It's about a year that I have this table but recently the data model has changed and the third column of the table is that is mandatory, so NULL values for column 3 cmporder are allowed. I want to know is if it is possible to change the definition of the table (for example using an ALTER statement) in order to remove the "NOT NULL" in the third column constraint? This way I can keep the 2 million lines that are already in the table and avoid making a bakup before the deletion and re-creation of the table.
  
  
  Thanks in advance,
  
  Kind regards
  Dariyoosh

  Yes its possible...

  ALTER TABLE ITEMS CHANGE cmporder NULL;

  It will do for you

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