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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3456) Allow removing not null from collumns particpating in unique constraint.
Date Fri, 07 Mar 2008 17:59:46 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576308#action_12576308
] 

A B commented on DERBY-3456:
----------------------------

Minor observation: the error message 42Z20 currently says:

  ERROR 42Z20: Column 'K' cannot be made nullable. It is part of a primary key or unique constraint,
  which cannot have any nullable columns.

Should this message be updated to exclude "unique constraint", since a unique constraint can
now have a nullable columns?

> Allow removing not null from collumns particpating in unique constraint.
> ------------------------------------------------------------------------
>
>                 Key: DERBY-3456
>                 URL: https://issues.apache.org/jira/browse/DERBY-3456
>             Project: Derby
>          Issue Type: Sub-task
>          Components: SQL, Store
>    Affects Versions: 10.4.0.0
>         Environment: all
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>         Attachments: altertable.diff, derby-3456-Tests.diff, derby-3456-Tests_v2.diff,
derby-3456v1.diff, derby-3456v2.diff, derby-3456v3.diff, derby-3456v4.diff, derby-3456v5.diff,
setnulltest.diff, upgradetests.diff, upgradetests_v2.diff
>
>
> Enable alter table to change a column that participates in a unique constraint to allow
nulls.

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