Provide ALTER TABLE functionality to change a column from NULL to NOT NULL or 
vice versa
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         Key: DERBY-1492
         URL: http://issues.apache.org/jira/browse/DERBY-1492
     Project: Derby
        Type: New Feature

  Components: Documentation, SQL  
    Versions: 10.1.3.1, 10.1.3.0, 10.1.2.1, 10.1.1.0, 10.0.2.1, 10.0.2.0, 
10.2.0.0    
    Reporter: Bryan Pendleton


Allow an existing column in an existing table to be changed from NULL to NOT 
NULL, or vice versa. Probably the syntax for this should be some variant on the 
ALTER TABLE statement.

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