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https://issues.apache.org/jira/browse/DERBY-3888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14144540#comment-14144540
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ASF subversion and git services commented on DERBY-3888:
--------------------------------------------------------

Commit 1626963 from [~knutanders] in branch 'docs/trunk'
[ https://svn.apache.org/r1626963 ]

DERBY-3888: ALTER TABLE ... ADD COLUMN cannot add identity columns

Update the syntax description to show that adding identity columns
with ALTER TABLE is allowed.

> ALTER TABLE ... ADD COLUMN cannot add identity columns
> ------------------------------------------------------
>
>                 Key: DERBY-3888
>                 URL: https://issues.apache.org/jira/browse/DERBY-3888
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.4.2.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>              Labels: derby_triage10_10
>         Attachments: d3888-1a.diff, d3888-2a-refman.diff, reenable-v2.diff, 
> reenable-v3.diff, reenable.diff, rrefsqlj81859.html
>
>
> ALTER TABLE .. ADD COLUMN cannot be used to add an identity column. There is 
> code to handle identity columns, but it is disabled in the parser. See this 
> thread on derby-user:
> http://mail-archives.apache.org/mod_mbox/db-derby-user/200708.mbox/%[email protected]%3E
> The code was disabled for DB2 compatibility. Since DB2 compatibility is not a 
> goal for Derby, we should see if we could re-enable it.



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