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

["Mike Matrigali (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-4?page=all ]

Mike Matrigali updated DERBY-4:
-------------------------------

      Component: SQL
    Description: 
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.



  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.



    Environment: 

> "order by" is not supported for "insert ... select"
> ---------------------------------------------------
>
>          Key: DERBY-4
>          URL: http://issues.apache.org/jira/browse/DERBY-4
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Reporter: Christian d'Heureuse
>     Priority: Minor

>
> 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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