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From "Bernt M. Johnsen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2167) Slightly misleading error message for UNIQUE constraint without NOT NULL constraint
Date Mon, 18 Jun 2007 13:41:26 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bernt M. Johnsen updated DERBY-2167:
------------------------------------

    Component/s: Newcomer

> Slightly misleading error message for UNIQUE constraint without NOT NULL constraint
> -----------------------------------------------------------------------------------
>
>                 Key: DERBY-2167
>                 URL: https://issues.apache.org/jira/browse/DERBY-2167
>             Project: Derby
>          Issue Type: Bug
>          Components: Miscellaneous, Newcomer
>            Reporter: Bernt M. Johnsen
>            Priority: Trivial
>
> With UNIQUE contraint, you get an error message which indicates you also need explicit
NOT NULL constraint for PRIMARY KEY constraint, which is not true . NOT NULL is implicit for
PRIMARY KEY (or more precise according to the lingo in the SQL standard: PRIMARY KEY is an
alternative syntax for UNIQUE NOT NULL)
> ij> create table t1 (i integer unique);
> ERROR 42831: 'I' cannot be a column of a primary key or unique key because it can contain
null values.
> ij> create table t2 (i integer unique not null);
> 0 rows inserted/updated/deleted
> ij> create table t3 (i integer primary key);
> 0 rows inserted/updated/deleted
> ij> create table t4 (i integer primary key not null);
> 0 rows inserted/updated/deleted

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