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From "Anurag Shekhar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3330) provide support for unique constraint over nullable columns
Date Thu, 14 Feb 2008 11:17:10 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568879#action_12568879

Anurag Shekhar commented on DERBY-3330:

Impact of isolation level

The records involved (new record and duplicate ) are always locked for update
which insures that there is exclusive lock on the record , irrespective of the isolation.
So nothing special need to be done with respect to isolation level.

> 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:
>         Environment: all
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>         Attachments: BTreeController.diff, derby-3330-testcase.diff, derby-3330.diff,
derby-3330v2.diff, derby-3330v3.diff, derby-3330v4.diff, derby-3330v5.diff, FunctionalSpec_DERBY-3330-V2.html,
FunctionalSpec_DERBY-3330.html, UniqueConstraint_Implementation.html
> Allow unique constraint over nullable field. Right now derby support unique constraint
only over not null columns.

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