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https://issues.apache.org/jira/browse/DERBY-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678583#action_12678583
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Dag H. Wanvik commented on DERBY-4:
-----------------------------------
Knut, its seems it does, cf. these productions (quote):
<query expression> ::=
[ <with clause> ] <query expression body>
[ <order by clause> ] [ <result offset clause> ] [ <fetch first clause> ]
<insert statement> ::=
INSERT INTO <insertion target> <insert columns and source>
<insert columns and source> ::=
<from subquery>
| <from constructor>
| <from default>
<from subquery> ::=
[ <left paren> <insert column list> <right paren> ]
[ <override clause> ]
<query expression>
This is just the syntax, however, but I haven't found any provision that would
bar it.
> "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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