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From "George Baklarz (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-166) NULL is not a valid constraint type
Date Mon, 07 Mar 2005 22:11:52 GMT
NULL is not a valid constraint type
-----------------------------------

         Key: DERBY-166
         URL: http://issues.apache.org/jira/browse/DERBY-166
     Project: Derby
        Type: Bug
  Components: Documentation  
    Versions: 10.0.2.0    
 Environment: Windows XP SP1 Professional
    Reporter: George Baklarz
    Priority: Trivial


The following statement in the documentation is incorrect:

NULL The opposite of NOT NULL (not really a constraint), it specifies that the column can
hold NULL values. Specifying NULL is the same as saying nothing at all, except when the column
is included in a PRIMARY KEY constraint.

If you try to create a column with the NULL attribute, you get a failure:

CREATE TABLE X ( A INT NULL );

ERROR 42X01: Syntax error: Encountered "null" at line 1, column 23.

While this isn't really a problem since we can just omit the NULL keyword, the documentation
gives the impression that it is allowed in the CREATE statement.

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