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Posted to derby-dev@db.apache.org by "Knut Anders Hatlen (JIRA)" <ji...@apache.org> on 2009/03/03 09:48:56 UTC
[jira] Commented: (DERBY-4) "order by" is not supported for "insert
... select"
[ https://issues.apache.org/jira/browse/DERBY-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678264#action_12678264 ]
Knut Anders Hatlen commented on DERBY-4:
----------------------------------------
It might be worth checking if SQL 2008 allows ORDER BY in INSERT INTO
... SELECT FROM ... . Dag wrote the following in DERBY-4079:
> Note that both ORDER BY and the new clauses above are allowed also in
> subqueries in the new version of the SQL standard (section 7.13). I
> only propose to include this at the top level in DERBY for now. (ORDER
> BY is presently also not allowed in subqueries in Derby since SQL
> didn't allow for this until SQL 2008 either).
> "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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