Can I use several nulls in a unique key column

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  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.
  
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  CREATE TABLE ARTICLES
  (
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  )
  
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  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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