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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DERBY-4) "order by" is not supported for "insert ... select"
Date Wed, 23 May 2007 15:52:16 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bryan Pendleton reassigned DERBY-4:
-----------------------------------

    Assignee:     (was: Bryan Pendleton)

I'm not actively working on this anymore, although it was a very interesting learning experience
and I'm quite grateful for all the comments and suggestions!

Hopefully this discussion will be useful to those who study this area further in the future.


> "order by" is not supported for "insert ... select"
> ---------------------------------------------------
>
>                 Key: DERBY-4
>                 URL: https://issues.apache.org/jira/browse/DERBY-4
>             Project: Derby
>          Issue Type: New Feature
>          Components: SQL
>            Reporter: Christian d'Heureuse
>            Priority: Minor
>         Attachments: insertOrderBy.diff, insertOrderBy_v2.diff, insertOrderBy_v3.diff,
samples.ij, samples.ij
>
>
> When filling a table with "insert ... select ...", "order by" cannot be specified.
> There is not method to copy a table sorted into another table (except using export/import).
This would be useful to optimize performance for big tables, or to create identity values
that are ascending (related to another column).
> Example:
> create table temp1 (
>    s varchar(10));
> insert into temp1 values 'x','a','c','b','a';
> create table temp2 (
>    i integer not null
>       generated always as identity
>       primary key,
>    s varchar(10));
> insert into temp2 (s)
>    select s from temp1 order by s;
> --> Error: "order by" is not allowed.
> -- trying to use "group by" instead of "oder by":
> insert into temp2 (s)
>    select s from temp1 group by s;
> select * from temp2;
> --> "group by" did not sort the table.

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