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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4146) Cannot insert row when a generated column references an identity column
Date Mon, 06 Apr 2009 15:06:12 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696118#action_12696118

Rick Hillegas commented on DERBY-4146:

Thanks for finding this bug, Knut. As a workaround, you can explicitly add the column names
to the insert statement. The following works:

  insert into t( c1, c2 ) values (default, default); 

I think that I agree with you and we should allow tables with this shape. However, I'm a little
unclear about how to interpret the SQL Standard, part 2, section 4.14.8, which says that generation
expressions may not reference other generated columns. For the purposes of this prohibition,
I think that the standard does not mean to include identity columns as a kind of generated
column. But if someone else has an opinion, please share it.

> Cannot insert row when a generated column references an identity column
> -----------------------------------------------------------------------
>                 Key: DERBY-4146
>                 URL: https://issues.apache.org/jira/browse/DERBY-4146
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
> ij> create table t (c1 int generated always as identity, c2 generated always as (c1));
> 0 rows inserted/updated/deleted
> ij> insert into t values (default, default);
> ERROR 23502: Column 'C2'  cannot accept a NULL value.
> Preferably, this should work. Alternatively, if it is not supposed to work, it should
fail when the table is created and the error message should state that a generated column
is not allowed to reference an identity column.

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