[10gr 2] Dungeon last not NULL val?

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• 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

• Purpose of "null is not null" and "null is null" statements

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  1 null is not null

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• How to add constraints not null

  Data modeling Version 4.1.1.888 SQL

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• Validate the file browse point is not null?

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  Hello

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• Is there a way to distinguish constraint not null null, out-of-line one online?

  Dear maters,

  Could you please help me to answer the question: How can we distinguish non-null online constraints (non-null column option) not null out-of-line ones (constraints, defined at the table level)? Below is an example of what I mean.

  1. Create a table.
     CREATE TABLE TEST (ID NUMBER NOT NULL);

  At this point, we have created a table with the constraint. The constraint was automatically created because of the option ' not null ' in the column definition. Say that the constraint name is SYS_C00699573. We can get the information about this user/all/dba_constraint or user/all/dba_cons_columns views.

  1. ALTER table.
     ALTER TABLE TEST ADD CHECK ('ID' IS NOT NULL).

  Here, we have created the second constraint as well. Say his name is SYS_C00699574. The only difference between them is that the first is online, and the second constraint is not. Is not only the terminology: If you file online - the 'NOT NULL' option also expires the DDL of the table. This is serious: for example, optimizer Oracle does not the id as nullable column either. If you drop the second - nothing like that happens. Oracle therefore somehow difference between online and offline constraints.

  1. Drop out-of-line constraint. At this point the question arises: How can we distinguish who among the two constraints is online and who isn't? From dba_constraint/all/user or user/all/dba_cons_columns views constraints search exactly except their names.

  Does anyone have an idea? Any help is very appreciated.

  Thank you.

  If you go here:

  SELECT * FROM SYS. CDEF$ WHERE OBJ #= you_table_object_id

  You can see the TYPE # is different, one is 7 (non-null) is 1 (check).

• Can check and not Null added to the names Administration constraints?

  I don't know if this is the right place to make a request for improvement, but it would be possible to add "and not Null Check constraints" in Tools-> object names Administration?

  It would be extremely useful for those who use them and also apply naming rules.
  Thank you

  

  I logged an ER

  Philippe

• 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.

• 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.

• Analytical function - County not null record

  
  Hi all

  Is it possible to count the column records is not null using anlaytical?

  Count (Column = 1) on)

  Thank you.

  «count (col) over (...)»  counts only non-null values...

  Some examples of data with tables to create and insert queries so that we can help you...

  See you soon,.

  Manik.

• If var! = NULL or if the variable is not NULL which is more correct?

  Hello Experts

  Which of the following is better?

  
  Also when assign us a variable (type nvarchar) null including notation should we use?

  new_address = NULL;

  or

  new_address = ";

  declare
  new_address ADDRESS. ADDRESS TYPE %;
  Start

  new_address: = 'a ';
  If new_address! = NULL then
  dbms_output.put_line(new_address||) e DO ');
  end if;

  end;

  declare
  new_address ADDRESS. ADDRESS TYPE %;
  Start

  new_address: = 'a ';
  If new_address is not NULL then
  dbms_output.put_line(new_address||) e DO ');
  end if;

  end;

  Thank you

  NULL is unknown.

  NULL = false NULL

  NULL! = NULL also false

  ----

  Ramin Hashimzade

• 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

• Addition of constraint not Null to a column that contains null values

  All,

  Could you please suggest me how to add the constraint not null to an existing column that has null values?

  SQL > create table nn (number n, s varchar2 (10));

  Table created.

  SQL > insert into nn values (1, 'test');

  1 line of creation.

  SQL > insert into values nn (2 '');

  1 line of creation.

  SQL > commit;

  Validation complete.

  SQL > alter table nn edit n number not null;

  Modified table.

  SQL > nn desc;

  Name                                      Null?    Type

  ----------------------------------------- -------- ----------------------------

  N NUMBER NOT NULL

  S                                                          VARCHAR2(10)

  SQL > alter table nn edit n number null.

  Modified table.

  SQL > nn desc;

  Name                                      Null?    Type

  ----------------------------------------- -------- ----------------------------

  N                                                  NUMBER

  S                                                  VARCHAR2(10)

  SQL > alter table nn change s varchar2 (10) not null;

  ALTER table nn change s varchar2 (10) not null

  *

  ERROR on line 1:

  ORA-02296: impossible to activate (SCOTT) - found null values

  SQL >

  Thank you

  Use NOVALIDATE:

  SQL > alter table nn change s varchar2 (10) not null;
  ALTER table nn change s varchar2 (10) not null
  *
  ERROR on line 1:
  ORA-02296: impossible to activate (SCOTT) - found null values

  SQL >
  SQL > alter table nn change s varchar2 (10) not null NOVALIDATE;

  Modified table.

  SQL > insert into values nn (3, null);
  insert into nn values (3, null)
  *
  ERROR on line 1:
  ORA-01400: cannot insert NULL into ('SCOTT'. "' NN '. » S »)

  SQL > select * from nn;

  N S
  ---------- ----------
  1 test
  2

  SQL >

  SY.