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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-3) Identity column not filled consecutively with "insert ... select distinct"
Date Thu, 15 Dec 2005 08:05:46 GMT
    [ http://issues.apache.org/jira/browse/DERBY-3?page=comments#action_12360491 ] 

Daniel John Debrunner commented on DERBY-3:
-------------------------------------------

While I agree it's not a bug, I could see this as an improvement.  It would be more natural
to have consective values in this case.

> Identity column not filled consecutively with "insert ... select distinct"
> --------------------------------------------------------------------------
>
>          Key: DERBY-3
>          URL: http://issues.apache.org/jira/browse/DERBY-3
>      Project: Derby
>         Type: Bug
>   Components: SQL
>  Environment: Derby Snapshot svnversion 46005
> or Cloudscape 10.0 GA
>     Reporter: Christian d'Heureuse

>
> When an "insert ... select distinct" is used to fill a table with an identity column,
gaps occur in the identity column. The caps correspond to the rows of the source table that
have been suppressed with "distinct".
> Example:
> create table temp1 (
>    s varchar(10));
> insert into temp1 values 'a','a','a','b','c','c','c','d';
> create table temp2 (
>    i integer not null
>       generated always as identity
>       primary key,
>    s varchar(10));
> insert into temp2 (s)
>    select distinct s from temp1;
> select * from temp2;
> output:
>  1   a
>  4   b
>  5   c
>  8   d

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