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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-789) Usability issue: "Constraints have the same set of columns"
Date Tue, 02 Mar 2010 20:11:27 GMT

    [ https://issues.apache.org/jira/browse/DERBY-789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840310#action_12840310
] 

Knut Anders Hatlen commented on DERBY-789:
------------------------------------------

Hi Bryan,

Allowing both PRIMARY KEY and UNIQUE on the same set of columns sounds uncontroversial to
me, unless, perhaps, if there's something in the SQL standard that says it should not be allowed.

You may find some of the discussion in DERBY-991 and DERBY-3300 useful for this issue too.

> Usability issue: "Constraints have the  same  set of columns"
> -------------------------------------------------------------
>
>                 Key: DERBY-789
>                 URL: https://issues.apache.org/jira/browse/DERBY-789
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Øystein Grøvlen
>            Assignee: Bryan Pendleton
>            Priority: Minor
>         Attachments: PrimaryImpliesUnique.diff
>
>
> Legolas Woodland reported on derby-user that derby return errors like :
> org.apache.derby.client.am.SqlException:                    Constraints
> 'SQL060103004635123'  and 'SQL060103004635121'  have the  same  set of
> columns, which is not allowed.
> He got this when creating a table like this:
> create  table  WEBSITES (USERID  integer  not  null unique,  WEBSITEID
> bigint  not  null unique,  DOMAINNAME  varchar(255)  not null  unique,
> DESCRIPTION  varchar(255),  PPVIEW   double,  PPCLICK  double,  PPWEEK
> double, totalClick bigint,  totalView bigint, active smallint, primary
> key (WEBSITEID));
> Omitting the unique specifier made things work. 
> I think this is a usability issue.   At least, one should not present names to the user,
that has been generated internally.  Instead, it would be helpful if the names of the columns
involved was mentioned. I see two ways to solve this:
> 1. Return error that says that  duplicate contraints on the following columns are not
allowed.
> 2. Allow this and use same index for both constraints.  (I guess dropping constraints
will be more complicated in this case since one will have to check if other constraints are
using the same index.)

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