[jira] Issue Comment Edited: (DERBY-4) "order by" is not supported for "insert ... select"

["Dag H. Wanvik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12773570#action_12773570 ] 

Dag H. Wanvik edited comment on DERBY-4 at 11/4/09 5:13 PM:
------------------------------------------------------------

You understood me correctly, Knut, cf. the explanation in DERBY-4413.



      was (Author: dagw):
    You understood me correctly, Knut, cf. the explanation in DERBY-4426.


  
> "order by" is not supported for "insert ... select"
> ---------------------------------------------------
>
>                 Key: DERBY-4
>                 URL: https://issues.apache.org/jira/browse/DERBY-4
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Christian d'Heureuse
>            Priority: Minor
>         Attachments: derby-4_dhw.diff, derby-4_dhw.stat, 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 no 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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