Columns not null showing that nullable in the table grid

Similar Questions

• 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

• 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.

• 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.

• My HP Officejet 8500 keeps showing that it is the cleaning of the print head in an infinite loop

  My HP8500 keeps showing that it is the cleaning of the print head. This does not block to print documents. OS is Windows 7 64 bit

  Hi NKritter,

  I recommend you do a Reset of power on your printer. To do this, follow the instructions below:

  1. press the power button to turn on the product.
  2. with the product, unplug the power cord from the back of the product.
  3. disconnect the power cord from the wall outlet.
  4. wait at least 15 seconds.
  5. plug the power cord into the wall jack.
  6. reconnect the power cord to the back of the product.
  7. If the product does not light by itself, press the Power button to turn it on.

• 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

• I have Safari 9.1, El Capitan. The changes I make in the Safari preferences are not saved after that I close the program. There is no such thing as a Library/Preferences/Safari. What should do?

  I have Safari 9.1, El Capitan. The changes I make in the Safari preferences are not saved after that I close the program. There is no such thing as a Library/Preferences/Safari. What should do?

  I think you're looking in the root folder not your home folder.   Tilde ~ in front of the first slash indicates the folder.

  Try this...

  Quit Safari.

  Open a Finder window. In the Finder menu bar, click go > go to folder

  Type or copy paste the following text:

  ~/Library/preferences/com. Apple.Safari.plist

  Click OK, and then move the com.apple.Safari.plist file to the trash.

  Restart Safari to test.

• FireFox says Java is outdatedon my computer, but the control panel of microsoft shows that it is the what is the latest version with that?

  Firefox said I need to update Java. But I get automatic updates from microsoft in the Control Panel Add or remove watch it shows that I have the latest version of Java. And it has been updated 11/02/12 I don't understand, are plug-ins something different

  You seem to have 1.6.0_29 of next generation Java plug-in installed, where 1.6.0_30 is the latest version of Java.

• Can I still use Photoshop on Mac OS 10.10.4 CS5.1? It does not open now that I updated the operating system. Error message: unexpected and unrecoverable error occurred.

  It does not open now that I updated the operating system. Error message: unexpected and unrecoverable error occurred.

  Can someone direct me to a patch file or a plugin that can solve this problem?

  Thank you!!

  Download 5.1 here: test of download Adobe CS5.5: direct links (no Assistant / Manager) | ProDesignTools

  Follow the Instructions of the very Important until you do, or the link does not work.

  If you have registered CS 5.1, you should have your serial number. Otherwise, run the installer and see id he'll do a repair.

• How to show under condition inside the table

  Hi Experts,

  JDev version 11.1.1.4.0.

  I have a table inside the table, I have 2 Date.MinValue i.e startdate and enddate. The necessary should be fired in the click of a button, apart from the table record.

  For each line, there is a date of start and enddate.

  Scenario1:

  StartDate = null. end date = null. When the click on save the date must be recorded and no message validation should be triggered when the click on the button Save. (It works fine).

  Scenario2:

  startDate = date and end date = null. When the click on save the date must be recorded and no message validation should be triggered when the click on the button Save. (It works fine).

  Scenario3:

  startDate = null and endDate = someDate. When the click on save the date must be registered and validation should be triggered only when the click on the button Save. (It works fine)

  Scenario 4: When I go start date and end date and remove the start date and pulls on the validation tab manually. But I want to be pulled on save button that is outside the table.

  Thank you

  Roy

  Try playing with the immediate property for af:table and autosubmit to date component. MinValue (must be false)

• 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);
  

• Printer 4700 shows that it is the wireless. It will print not wireless. I used all the information hp

  Printer 4700 shows that its wireless, but it does not print wireless. Information for this set up has been tried

  seversl time and technical support have yet to fix.

  My router has inside and one ip address.

  Help would be a plus.

  Okay, because the printer seems to be on the network, the problem is with your computer.  What operating system?

• 5 Lightroom does not start but shows that run in the Task Manager?

  Hello

  I use Lightroom 5.7 (64-bit) on a Win7 machine and it worked perfectly until a few days ago. Now for reasons unknown to me, it will now not start correctly. According to the Task Manager, run, but nothing appears on the screen. It shows as a running process with about 15 020 k. If I try and interrupt the process he won't stop until I've tried 4 or 5 times.

  I tried to rename the file to preview force it to build a new file and optimize the database and he ran once, said he was checking the catalog and then came back to the same behavior.

  If I can get it started I can return to a backup of database.

  Help appreciated.

  Peter

  Thanks for the comments.

  It turns out that Lightroom is not guilty.  The hard drive containing the catalog was not, and although tests seem to show like OK it was made only reading / writing at a fraction of the correct speed. If Lightroom was very time consuming to read it's own catalog.  It tooks 48 hours to exemplary concert 1 of data off the drive.

• 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.