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Posted to derby-dev@db.apache.org by "Christian d'Heureuse (JIRA)" <ji...@apache.org> on 2009/11/04 00:10:32 UTC
[jira] Updated: (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:all-tabpanel ]
Christian d'Heureuse updated DERBY-4:
-------------------------------------
Description:
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.
was:
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.
> "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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