Re: Specifying column datatypes in CTAS

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Wed, 25 Feb 2004 02:22:37 +0200
Message-ID: <1e9c01c3fb35$7a570e70$73f823d5@porgand>

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_at_transurban.com.au> To: <oracle-l_at_freelists.org> 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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Received on Tue Feb 24 2004 - 18:19:39 CST