Quick question: alter table, alter column NOT NULL...

Similar Questions

• ALTER Table Add column not null, no default

  I want to add two columns in a table with not null, and the default value 0 for two columns
  Can I write everything in a single statement or do I have to divide the declaration
  I tried, but didn't work
  
  ALTER table DWSODS01. DWT00301_ORD_DTL_OMS add)
  COMB_ORD_FLG NUMBER (5.0) default null, 0
  COMB_ORD_NO NUMBER (12.0)
  by default, 0 not null);
  
  How can I change the code?

  user10390682 wrote:
  OK, so if it is NOT NULL, while there should be a value.

  Yes.

  So, when I set these two columns as NOT NULL will only future data must be NON NULL.
  What of the old and present data if I defined as NOT NULL

  NOT NULL mean value of eachcolumn + line (current or future) _ must not be null. That's why always adding NOT NULL column to a non-empty table fails - the column value for existing lines will be NULL which does NOT violate the constraint nullability. If you add the NON NULL column with a default value, the column will be added and all lines existing column value will be defined by specified default (0 in your case). As a result Oracle will be able to settle forced to null for this newly added column from the value of this column in all the existing lines will be not not null (0 in your case).

  SY.

• Adding column not null in the existing table.

  How to add a column not null in the existing table?
  explain.
  Thank you

  create table abc_ex(a number);
  
  alter table abc_ex add(b number not null);
  
  desc abc_ex
  

  If for use then change to ALTER column extising

  Published by: nkvkashyap on May 27, 2013 21:49

• Columns not null showing that nullable in the table grid

  I use 2.1.0.63 sql developer.
  I ran the following in my diagram
  

    CREATE TABLE EXCLUDE_DATA 
     (OWNER       VARCHAR2(30), 
      TABLE_NAME  VARCHAR2(30), 
         COLUMN_NAME VARCHAR2(30), 
         CONSTRAINT CK_OWNER CHECK (owner IS NOT NULL) ENABLE, 
         CONSTRAINT CK_TABLE_NAME CHECK (table_name IS NOT NULL) ENABLE
     );
   
   COMMENT ON TABLE EXCLUDE_DATA IS 'Tables and Columns to exclude from the column checker';
   COMMENT ON COLUMN EXCLUDE_DATA.OWNER IS 'The schema that contains the table';
   COMMENT ON COLUMN EXCLUDE_DATA.TABLE_NAME IS 'The table name to be excluded from the column checker';
   COMMENT ON COLUMN EXCLUDE_DATA.COLUMN_NAME IS 'The column on the table to be excluded.  If null then the whole table is excluded';
  
    CREATE UNIQUE INDEX UK_EXCLUDE_DATA ON EXCLUDE_DATA (OWNER, TABLE_NAME, COLUMN_NAME);

  When the name of the table is selected, and the tab for the column that is selected in the main window it's showng columns as nullable (see below)

  OWNER     VARCHAR2(30 BYTE)     Yes          1     The schema that contains the table
  TABLE_NAME     VARCHAR2(30 BYTE)     Yes          2     The table name to be excluded from the column checker
  COLUMN_NAME     VARCHAR2(30 BYTE)     Yes          3     The column on the table to be excluded.  If null then the whole table is excluded

  The constraints are there however, it looks like a potential problem with just this window.

  CeeJay

  Adding a not null to a column check constraint does not have the non-nullable column.

  Try instead this statement

  CREATE TABLE EXCLUDE_DATA
  (THE VARCHAR2 (30) IN OWNER NOT NULL,)
  TABLE-NAME VARCHAR2 (30) NOT NULL,
  COLUMN_NAME VARCHAR2 (30)
  );

  COMMENT on TABLE EXCLUDE_DATA IS "Tables and columns to exclude from the audit of the column;
  COMMENT ON THE EXCLUDE_DATA COLUMN. OWNER IS 'of the schema that contains the table.
  COMMENT ON THE EXCLUDE_DATA COLUMN. Table_name IS "the name of table to be excluded from the audit of the column;
  COMMENT ON THE EXCLUDE_DATA COLUMN. Column_name IS ' column on the table to be excluded. If set to null, then the entire table is excluded. "

  CREATE A UNIQUE UK_EXCLUDE_DATA ON EXCLUDE_DATA (OWNER, TABLE_NAME, COLUMN_NAME) INDEX;

  The database AUTOMATICALLY adds check for columns NOT NULL constraints.

  Hope this helps

  Concerning
  Chris

• ADD A NEW COLUMN NOT NULL

  Hello
  I try to add a new column not null in the emp default table exist. Initially, I created the column (like BONUS) and then I try to apply the constraint in this amended by order. But it does not happen I mean forced is not added to the column as already the column will have NULL values for records existing (or lines). Can someone help me how to solve the problem?
  
  Thank you and best regards,
  Vishnu.

  first disable constraint...

  ALTER table dept change the ur_constraint_name disable constraint;

  then insert the data can

  ALTER table dept change the ur_constraint_name novalidate constraint;

  then

  ALTER table dept change enable NOVALIDATE constraint ur_constraint_name;

  Try this we can help

• Change the default value of column NOT NULL to NULL

  Hi all
  How can I change the default value of column not NULL to NULL?
  Suppose I have run the following commands:

  SQL> alter table hr.test modify temp_num2 default null;
  
  Table altered.
  
  SQL> desc hr.test;
   Name                            Null?    Type
   ----------------------------------------- -------- ----------------------------
   TEMP_NUM                             NUMBER
   TEMP_NUM2                       NOT NULL NUMBER

  Why forced temp_num2 has not changed with the NULL value? I'm under 11.g rel2
  
  Best regards
  Valerie

  You can NOT change the column constraint NULL to contain NULL values by:

  alter table table_name modify column_name null; 
  

  After this change, the column can contain null values. In Oracle, not null constraints are created automatically when not null is specified for a column. Similarly, they are deleted automatically when the column is changed to allow NULL values.

• force a view column not null

  I can't create a view with a column not null. Using this script, you can see that the resulting table is a constraint not null for the first column, even if the two columns of the source of this line are not null. Is anyway to force the view on the occasion of this first column as not null? (I need to ODP.NET if I get an error here)
  
  DROP TABLE MYTABLE;
  
  CREATE the table MYTABLE
  (COL1 NUMBER (2) NOT NULL,)
  col2 number (2));
  
  drop table mytable2;
  
  CREATE the MYTABLE2 table
  (THE NUMBER (2) COLA NOT NULL,)
  colB number (2));
  
  create or replace view MYVIEW as select col1, col2 from mytable union select cola, colb from mytable2;
  
  Bird DESC;

  >
  Is anyway to force the view on the occasion of this first column as not null?
  >
  No--and there's a related problem if you create a table with a view. For example, the table emp has empno as NOT NULL. I have a copy of the named emp1 emp where empno is also NOT NULL.

  create or replace view v_emp as select empno from emp
  

  A view on the highest describe statement shows empno as NOT NULL. But, as you've discovered if you ask another Union column will become NULLABLE in the view described.

  The question is that if I use the view (on the single table of emp - no union or the second query) to create a table

  create table t_emp as select * from v_emp
  

  A describe on this table statement will show empno as NULLABLE.

• Update on nulls in the column vs add column not null default 11 g

  Hello
  
  Let's take a scenario following 1. *
  
  We have a large partitioned table LARGE_TABLE1 (say: NUM_ROWS 5 904 977 029, size GB 326) in the Oracle 11 database.
  
  We want to add a new column NEW_COLUMN (NUMBER) and give a value of-999 to NEW_COLUMN each record in this table.
  

  ALTER TABLE LARGE_TABLE1 ADD (NEW_COLUMN NUMBER DEFAULT -999 NOT NULL);

  In Oracle 11 it would probably a second since the value of default -999 would be permanently added in metadata without updating each and every record 6 bln.
  
  Take a scenario 2 *
  
  We have another large partitioned table LARGE_TABLE2 (of similar size as LARGE_TABLE1) in the Oracle 11 database.
  
  We have an existing EXISTING_COLUMN (NUMBER) column that contains nulls 90% (90% of scores only contain null values in the field, and 10% of the scores only contain non-null values in this field)
  
  I would like to replace null values in EXISTING_COLUMN with number - 999.
  
  Update the column full Ascension not going :-) and doing so in a loop (the partition partition) would take a few days.
  
  Question:
  Do you know a way somehow write this -999 "overall" in the metadata as in scenario 1 instead of updating a null value in all the records to-999? No clever workaround solution would be appreciated...
  
  Edited by: SwPiotr 2012-04-24 07:26

  ALTER TABLE LARGE_TABLE1 ADD NEW_COLUMN NUMBER GENERATED ALWAYS AS nvl(col1, -999);
  

• 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

• Column not null in rows in SQL query

  I have the below query,

  WITH t

  Did YOU (SELECT NULL col_1, col_2, 'C' FROM DUAL col_3 NULL

  UNION ALL

  SELECT 'A' col_1, col_2 NULL, NULL FROM DUAL col_3

  UNION ALL

  NULL SELECT col_1, col_2 "B", NULL FROM DUAL col_3)

  SELECT *.

  T;

  who will pick up three rows, on which single column will have a value for each row.
  And the other columns are left out as below.

  COL_1	COL_2	COL_3
  		C
  A
  	B

  I don't need that values should be extracted in the column name that is not null.

  as

  COL_1	COL_2	COL_3
  A	B	C

  
  Please advise me

  You can use the MAX aggregate function. But do not know what you are trying to reach.

• Constraint CHECK on a column not null

  Is this OK
  
  create table tab
  check the col1 varchar2 (10) not null (col1 in (' has ',' b '),)
  col2 varchar2 (10) check (col2 in ('c' ' d ' "))
  );

  Hello

  The syntax was that not good use

   CREATE TABLE tab
  (
     col1   VARCHAR2 (10) NOT NULL CHECK (col1 IN ('a', 'b')),
     col2   VARCHAR2 (10) CHECK (col2 IN ('c', 'd'))
  );
  

  Concerning

• Oracle Spatial Index on a column NOT NULL

  I'm using the Oracle 11 g with data space init.
  
  I have a SDO_GEOM column in a table that has NULL values for some records. I have to run spatial query based on this column so the need of a spatial index on it. Is it possible to create a Spatial Index on a column SDO_GEOM even if some of them have the NULL value and results of spatial query?
  
  
  Thank you
  Alan
  
  Published by: user3883362 on 29 April 2013 05:59

  Alan,

  Is it possible to create a Spatial Index on a column SDO_GEOM even if some of them are NULL

  Yes.

  SQL> CREATE TABLE test (ID NUMBER PRIMARY KEY, geom MDSYS.SDO_GEOMETRY);
  
  Table created.
  
  -- "insert a row with non-NULL geometry"
  SQL> INSERT INTO test VALUES (1, SDO_GEOMETRY('POINT (6000000 2100000)', 40986));
  
  1 row created.
  
  -- "insert a row with NULL geometry"
  SQL> INSERT INTO test VALUES (2, NULL);
  
  1 row created.
  
  SQL> CREATE INDEX test_spx ON test (geom) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
  
  Index created.
  

  .. .and getting results of spatial query

  Yes, assuming that your data is valid.

  -- "Creates a 10' buffer around the point we previsouly inserted then applies SDO_INSIDE"
  SQL> SELECT ID, SDO_INSIDE(geom, SDO_GEOM.SDO_BUFFER(geom, 10, 1)) FROM test;
  1 TRUE --"our point geometry"
  2 FALSE --"our NULL"
  
  2 rows selected.
  

  If you encounter problems here, I think you can use the functions that are choking in NULL values, for example, the conversion of NULL in WKT geometry.

  How do you access data (sqlplus, application, custom, etc.)? What is the query, and we see a few examples of data?

  Kind regards
  Noel

• How to add the not null columns to an existing table?

  I have a table with hundreds of row inside. I try to add a new column not null. It gives me the following error
  
  ALTER TABLE sys.xyz CHANGE xyz_no number 4 DEFAULT '1' NOT NULL;
  
  ORA-02296: impossible to activate (sys.) - found null values
  
  Also I tried to do the following
  
  ALTER TABLE sys.xyz CHANGE xyz_no number 4 DEFAULT '1';
  
  And then I tried to ALTER TABLE sys.xyz CHANGE xyz_NO number 4 NOT NULL; and I still gives me the same error. I took the tally for null values for the same column and has 1555.
  
  In this case how can I change my article with not null not?. Please help, I am a newbie in oracle.

  I cry out to you for creating a table as SYS. However, I'm going to fully support Sybrand making. Never, ever, create any object as SYS unless the source code received you from Oracle in a patch.

  Now to your question.

  SQL> CREATE TABLE test (
    2  col1 NUMBER,
    3  col2 NUMBER);
  
  Table created.
  
  SQL> INSERT INTO test VALUES (1,1);
  
  1 row created.
  
  SQL> INSERT INTO test VALUES (2,NULL);
  
  1 row created.
  
  SQL> ALTER TABLE test ADD (newcol NUMBER);
  
  Table altered.
  
  SQL> ALTER TABLE test
    2  MODIFY (newcol NOT NULL DISABLE);
  
  Table altered.
  
  SQL> SELECT * FROM test;
  
        COL1       COL2     NEWCOL
  ---------- ---------- ----------
           1          1
           2
  
  SQL> UPDATE test SET newcol = 3;
  
  2 rows updated.
  
  SQL> SELECT * FROM test;
  
        COL1       COL2     NEWCOL
  ---------- ---------- ----------
           1          1          3
           2                     3
  
  SQL> SELECT constraint_name
    2  FROM user_constraints
    3  WHERE table_name = 'TEST';
  
  CONSTRAINT_NAME
  ------------------------------
  SYS_C0036620
  
  ALTER TABLE test ENABLE CONSTRAINT SYS_C0036620;
  

• Column mandatory (NOT NULL) constraint

  Need not pre-existing NOT NULL constraint column label presented next to the default column, column name and data type, when you display a data model to engineering reverse for end users to review the provisions of tables. How and NOT on label NULL is generated for display of reverse engineering constraints?

  I'm not sure to understand what you want - have marked the columns not null (required) on diagram (they are marked with ' *' character before the name of column) or not null constraint name printed on the diagram. I first thought that it is generation of DDL.

  Philippe

• What is the solution to add is not null to an existing table that has the data

  I have an employee table that contains the data that I want to change the column NOT NULL .i get error saying e-mail
  table cannot be changed when the data is there... any other solution for this?

  I have an employee table that contains the data that I want to change the column not NULL.
  I get error message saying table cannot be changed when the data is there... any other solution for this?

  Create a new column that can contain NULL.
  New column UPDATED with the old data
  remove the old column
  Rename new old column_name column