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https://issues.apache.org/jira/browse/DERBY-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663716#action_12663716
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Knut Anders Hatlen commented on DERBY-4016:
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SQL allows this construct, which is still not accepted by Derby, I think:
ALTER TABLE t ALTER COLUMN c DROP DEFAULT
> Document syntax change for ALTER TABLE in Reference Manual
> ----------------------------------------------------------
>
> Key: DERBY-4016
> URL: https://issues.apache.org/jira/browse/DERBY-4016
> Project: Derby
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 10.5.0.0
> Reporter: Kim Haase
> Assignee: Kim Haase
> Priority: Minor
>
> DERBY-4013 adds support for the standard SET keyword in addition to the
> optional WITH keyword in ALTER TABLE ALTER [COLUMN] statements. This change
> should be documented in the Reference Manual.
> Question: [WITH] DEFAULT occurs also in ALTER TABLE ADD COLUMN. Will SET work
> here as well?
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