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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-3330) provide support for unique constraint over keys that include one or more nullable columns.
Date Fri, 10 Oct 2008 17:31:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mike Matrigali resolved DERBY-3330.
-----------------------------------

    Resolution: Fixed

I committed a bunch of this work.  I believe this can be resolved/closed with all the work
checked into 10.4.  

> provide support for unique constraint over keys that include one or more nullable columns.
> ------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3330
>                 URL: https://issues.apache.org/jira/browse/DERBY-3330
>             Project: Derby
>          Issue Type: New Feature
>          Components: SQL, Store
>    Affects Versions: 10.4.1.3
>         Environment: all
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>         Attachments: BTreeController.diff, db2Compatibility-v2.diff, db2Compatibility.diff,
derby-3330-testcase.diff, derby-3330-UpgradeTests.diff, derby-3330.diff, derby-3330_followup_1.diff,
derby-3330_followup_1_modified.diff, derby-3330v10.diff, derby-3330v11.diff, derby-3330v12.diff,
derby-3330v13.diff, derby-3330v2.diff, derby-3330v3.diff, derby-3330v4.diff, derby-3330v5.diff,
derby-3330v6.diff, derby-3330v7.diff, derby-3330v8.diff, derby-3330v9.diff, derbyall_report.txt,
FunctionalSpec_DERBY-3330-V2.html, FunctionalSpec_DERBY-3330.html, sortercomments.diff, UniqueConstraint_Implementation.html,
UniqueConstraint_Implementation_V2.html, UniqueConstraint_Implementation_V3.html, UniqueConstraint_Implementation_V4.html
>
>
> Allow unique constraint over keys which include one or more nullable fields.  Prior to
this change Derby only supported unique constraints on keys that included no nullable columns.
 The new constraint will allow unlimited inserts of any key with one more null columns, but
will limit insert of keys with no null columns to 1 unique value per table.
> There is no change to existing or newly created unique indexes on null columns (as opposed
to unique constraints on null columns).  Also there is no change to existing or newly created
constraints on keys with no nullable columns.

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