Adding column not null in the existing table.

Similar Questions

• Add the constraint not NULL in the existing table that has null values

  Hello

  I want to add a constraint not null to and an existing table, but the table already contains values null in this column.

  EMP

  Emp_id name

  1 axada

  2

  3 sdkdd

  Here is already the data IE 2 empid is Null as name. I must add a fool of constraint not null which new values will not be null, but I don't want to change the data of exisitng alreadt which is null.

  Hello

  "The opposite": NOVALIDATE does not validate the data that is ALREADY in the table, but do not allow the insertion of a NULL value.

  Have you tried my sample code?

  CREATE TABLE MaTable (x NUMBER PRIMARY KEY, y NUMBER);

  INSERT INTO myTable VALUES (1, 123);

  INSERT INTO myTable VALUES ( 2, NULL );

  INSERT INTO myTable VALUES (3, 456);

  ALTER TABLE mytable MODIFY (y NOT NULL NOVALIDATE );

  INSERT INTO myTable VALUES (4, 678);

  INSERT INTO myTable VALUES ( 5, NULL );

  SELECT * FROM MyTable;

  '2' line was inserted with null before the creation of the NOT NULL constraint, this line remains "as what" at the end of the trial.

  '5' line trying to insert a NULL value after creating the NOT NULL constraint, which is denied.

  Best regards

  Bruno.

• 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

• Include a column not used in the Join Tables

  Hi all
  I need a temporary xy column in the select list not the tables I used for Assembly.
  
  As SELECT a.abc, b, def
  Of arety one
  Left outer join
  bgtyu b
  on a.id = b.id
  
  I need an additional column as xy not used from any table
  
  
  SELECT a.abc, b.def, xy
  Of arety one
  Left outer join
  bgtyu b
  on a.id = b.id

  Hello

  Try,

  SELECT a.abc,b.def, 'xy' TEMP_COL
  FROM arety a
  Left outer join
  bgtyu b
  on a.id=b.id
  

  In any case, what is the use of this? Can you explain your real need?

  I hope this helps.

  Kind regards

  Manu.

  Published by: Manu. on March 28, 2012 07:07

• 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

• 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

• 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.

• 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.

• Create procedure upsert (name of the existing table, incoming table name)

  Is it possible to create a procedure that makes a merge (upsert) with only two parameters:

  1. Existing Table name - name of table that will have data merged into it.
  2. Incoming Table name - name of the table that has developed data day/news.

  The method would be:

  1. Use primary keys on the "existing" table as the condition links
  2. Fact and update if exists and insert new
  3. no record
  4. no clues
  5. no removal clause

  Oracle 11g

  MERGE < tip > < table_name >

  USING < table_view_or_query >

  (< CONDITION >)

  WHEN MATCHED THEN < update_clause >

  DELETE < where_clause >

  WHEN NOT MATCHED THEN < insert_clause >

  [ERRORLOG < log_errors_clause > < reject limit < integer | unlimited >];

  < table_name > - from input parameter

  < table_view_or_query > -socket input parameter

  < condition > - primary key links (how search a single/multiple primary keys and return the list?)

  < update_clause > - update all columns (other than KP, how to get and use a dynamic list of columns)

  < where_clause > - not used

  < insert_clause > - insert new records for all columns (including the PK (s))

  declare

  p_source varchar2 (30): = "EMP_X";

  p_target varchar2 (30): = "EMP_Y";

  query varchar2 (32000);

  function get_cols (p_table in varchar2) return varchar2 is

  VARCHAR2 (32000) retval;

  Start

  Select the Group (order of column_id) listagg (column_name, ',')

  in retval

  of user_tab_cols

  where table_name = p_table

  Table_name group;

  Return retval;

  end;

  function get_keys (p_table in varchar2) return varchar2 is

  VARCHAR2 (4000) retval;

  Start

  Select listagg (cc.column_name, ',') in the Group (order by cc.position)

  in retval

  from user_constraints c,.

  user_cons_columns cc

  where cc.table_name = p_table

  and c.constraint_type = 'P '.

  and cc.table_name = c.table_name

  and cc.constraint_name = c.constraint_name

  C.table_name group;

  Return retval;

  end;

  function merge (p_merge1 varchar2, p_merge2 varchar2, p_link varchar2) return varchar2 is

  Merge1 varchar2 (32000): = p_merge1 | «, » ;

  merge2 varchar2 (32000): = p_merge2 | «, » ;

  VARCHAR2 (32000) retval;

  Start

  then merge1 is not null

  loop

  retval: = retval | » t.'|| substr (Merge1, 1, InStr (Merge1, ',') - 1) |'s =.' | substr (merge2, 1, InStr (merge2, ',') - 1);

  Merge1: = substr (merge1, instr(merge1,',') + 1);

  merge2: = substr (merge2, instr (merge2, ',') + 1);

  If merge1 is not null then

  retval: = retval | p_link;

  end if;

  end loop;

  Return retval;

  end;

  Chopper (p_cols p_keys varchar2, varchar2) return varchar2 is

  passes varchar2 (32000): = ', '. p_cols | «, » ;

  keys varchar2 (32000): = ', '. p_keys | «, » ;

  VARCHAR2 (32000) retval;

  Start

  While the keys! = «, »

  loop

  If instr (passes, substr (keys, 1, instr(keys,',',1,2))) = 1 then

  cols: = substr (collars, instr(cols,',',1,2));

  on the other

  cols: = substr (passes, 1, instr (passes, substr (keys, 1, instr(keys,',',1,2))) | substr (collars, InStr (collars, ',', InStr (passes, substr (Keys, 1, InStr(Keys,',',1,2))), 2) + 1);)

  end if;

  keys: = substr (keys, instr(keys,',',1,2));

  end loop;

  return trim (both ',' collar);

  end;

  Start

  query: = 'merge'. p_target |' t ' |' using (select ' | get_cols (p_source): ' from ' | p_source |') s '.

  ' on ('|) Merger (get_keys (p_target), get_keys (p_source), 'and') |') ' ||

  "When matched then update set ' | '. Merger (Chopper (get_cols (p_target), get_keys (p_target)), Chopper (get_cols (p_source), get_keys (p_source)), ',').

  «When not matched then insert ('|)» get_cols (p_target) |') values (s.'|) Replace (get_cols (p_source),', ', ', s') |') ';

  dbms_output.put_line (Query);

  end;

  
  

  Fusion in EMP_Y t using (select EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO EMP_X) s on (t.EMPNO = s.EMPNO and t.ENAME = s.ENAME) when matched then update set t.JOB = s.JOB, t.MGR = s.MGR, t.HIREDATE = s.HIREDATE, t.SAL = s.SAL, t.COMM = s.COMM, t.DEPTNO = s.DEPTNO when not matched then insert (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO) values (s.EMPNO, s.ENAME, s.JOB, s.MGR, s.HIREDATE, s.SAL, s.COMM, s.DEPTNO)

  Concerning

  Etbin

• 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.

• I want to install WIN 7 on my Dell XP computer. The disc I bought says that the hardsrive must be clean first. The disc does not start on the existing XP. How can I do this?

  I want to install WIN 7 on my Dell XP computer. The disc I bought says that the hard disk must be clean first. The disc does not start on the existing XP. How can I do this?

  Hello

  Have you changed the boot order?

  You need to change the Boot order to make the DVD/CD drive 1st in the boot order and boot from the Windows 7 DVD:

  How to change the Boot order in BIOS:

  http://pcsupport.about.com/od/fixtheproblem/SS/bootorderchange.htm

  Do install a cleaning, removal of the existing XP partition and create a new partition to install 7 on in the own installation process:

  http://www.SevenForums.com/tutorials/1649-clean-install-Windows-7-a.html

  See you soon.

• The logged data is not loaded in the target table in cdc-compatible?

  Hello

  I tried with cdc-simple concept on single table.

  I had loaded, journaled table (only changed records) inserted in the simple target in cdc table. Its working fine.

  When I work on cdc-consistent and logged data are not loaded in the target table

  For this, I used the data model, it has 3 data stores. log the without option of data, its works very well.

  When I am trying to load tables logged in the target table in interface, its running fine.

  To do this, I chose "logged data only.

  Although I have not changed the records in the target table. target table is empty after the executed insterface.

  

  

  

  

  I chose the real option of insertion in ikm. But the logged data that is not inserted in the target table.

  Please help me.

  Thankin advacnce,

  A.Kavya.

  Hello

  You must EXPAND WINDOW and LOCK SUBSCRIBERS before consuming the CDC data:

  http://docs.Oracle.com/CD/E14571_01/integrate.1111/e12643/data_capture.htm#ODIDG283

  Subsequently, you unlock Subscriber and purge the log.

  Better to put a package to automate the whole thing.

• Record not found in the HR_API_TRANSACTION table

  Hello
  Through workflow in the absence of information is approved and made its appearance in the per_absence_attendances table.
  I would now like to return path and want to identify the workflow id is to say ITEM_KEY and all its notifications.
  
  Note that leave the related data is not present in the HR_API_TRANSACTION table once the report is approved.
  
  where oracle to store all this information?
  
  Thank you.

  Once the transaction is complete, details are then moved to pqh tables. He is the type of a table in the back for the hr_api_tranasactions. No purging of workflow tables does not affect pqh tables

• 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);
  

• Not Null on the column of a primary key constraint

  I came across a table defined in the same way to...
  
  create table t (t_id int constraint nn_t_id not null constraint pk_t primary, data key number);
  
  Of course, the primary key is the is not null, then is there a reason to add the redundant constraint not null?

  There are two parts to your question, I think:

  (1) why add a NOT NULL if a primary key is also reported.
  (2) why is null is NOT a name defined by the user (in this case nn_t_id).

  1 > I think you are right: there is no difference in behavior in the way that Oracle is going to reject the creation of NULL in this column (whether through the direct insert or update with a NULL value). I personally always declares the NOT NULL for columns, I know to never have null, regardless of whether the column is (member of) a PK.

  It's pretty funny, btw, the SQL standard as chosen able to be the NULL default value. I think that we all type much less, if the SQL standard chose NOT NULL default value. But that's another story.

  2 > I don't see given nullability defined by the user of the explicit names now and then, because of some "coding guideline' which dictates that constraint names must never be generated System. This guideline is often presented as a result of the exception handling of "client-side", where the constraint name is filtered SQLERRM and then more personalized to be displayed to the end user. However for NOT NULL constraint violations, I think (does not fully to check) that you are always thrown an ORA-01400 is an ORA-01407. Who nowadays both will tell you exactly (in SQLERRM) which column of this table is currently in violation of a NOT NULL constraint.

  Toon