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https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560055#action_12560055
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Anurag Shekhar commented on DERBY-3330:
---------------------------------------

This issue started as a part of Derby-2212 but latter it was discussed that its 
safer to provide this functionality just by having unique constraint over null 
able columns and behavior of index is left unchanged.

Please read comments in Derby-2212 for the background information about this 
issue.

> provide support for unique constraint over nullable columns
> -----------------------------------------------------------
>
>                 Key: DERBY-3330
>                 URL: https://issues.apache.org/jira/browse/DERBY-3330
>             Project: Derby
>          Issue Type: New Feature
>          Components: Store
>    Affects Versions: 10.4.0.0
>         Environment: all
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>
> Allow unique constraint over nullable field. Right now derby support unique 
> constraint only over not null columns.

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