[
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
