Re: Specifying column datatypes in CTAS
- From: Mark Richard <mrichard@xxxxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 25 Feb 2004 11:45:33 +1100
Hi Tanel,
I think you may be correct - I was really hoping to combine it into a
single statement but I guess the net result is basically the same. I was
just surprised that CREATE TABLE doesn't allow specific column specs to be
defined when using the AS SELECT clause. Does anyone know if this
situation has changed in Oracle 9 or 10?
Regards,
Mark.
Tanel Põder
<tanel.poder.003@m To:
<oracle-l@xxxxxxxxxxxxx>
ail.ee> cc:
Sent by: Subject: Re: Specifying column
datatypes in CTAS
oracle-l-bounce@fr
eelists.org
25/02/2004 11:22
Please respond to
oracle-l
Precreate the table with the structure you like and use INSERT /*+ APPEND
*/
command to populate your table afterwards.
Tanel.
----- Original Message -----
From: "Mark Richard" <mrichard@xxxxxxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Wednesday, February 25, 2004 1:00 AM
Subject: Specifying column datatypes in CTAS
>
>
>
>
> Hi List,
>
> I have stumbled across a problem and I am hoping there is an easy
solution.
> I have to add two columns to an existing table. One of these columns is
> populated with a constant value for all existing records and the other
can
> be determined using a simple DECODE on other existing columns.
>
> The table is quite large (~100 million records) and I was hoping to
combine
> the activity with a rebuild into a new tablespace at the same time.
> Therefore, I figure the quickest way to achieve this is a simple "create
> table as select" type statement.
>
> My problem is specifying the datatypes, and in particular the NOT NULL
> state of the newly added columns. Working on Oracle 8.1.7.4 I get an
error
> if I try something like "create table my_dual (the_col varchar2(10) not
> null) as select * from dual" - I cannot specify datatypes when using an
"as
> select..." clause it seems.
>
> I realise I can name the new columns using column aliasing in the select
> clause, but I am struggling to get the length of the data type and the
NOT
> NULL attribute set on the new columns.
>
> What is the best way to resolve this problem? Is there some syntax I am
> missing or do I absolutely need to create structure and then insert data?
>
> Thanks in advance,
>
> Mark.
>
>
>
>
>
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