RE: changing a column type
- From: "Sweetser, Joe" <JSweetser@xxxxxxxx>
- To: "gjilevski@xxxxxxxxx" <gjilevski@xxxxxxxxx>, "rui_catcuddler@xxxxxxxxx" <rui_catcuddler@xxxxxxxxx>
- Date: Fri, 1 Jun 2012 19:35:38 +0000
As the link Guenadi sent describes, there are limitations but this is something
that I never thought was possible until now. Another reason to like hanging
out here. :)
Taking it one step further and expanding on Tim's example...
JSWEETSER@sandbox> create table test1 (pk number, col1 number, constraint
joe_pk primary key (pk));
Table created.
JSWEETSER@sandbox> desc test1
Name Null? Type
----------------------------------------- -------- ----------------------------
PK NOT NULL NUMBER
COL1 NUMBER
JSWEETSER@sandbox> insert into test1 values (1, 99);
1 row created.
JSWEETSER@sandbox> insert into test1 values (2, 200);
1 row created.
JSWEETSER@sandbox> create table test1_interim (pk number, col1 varchar2(30),
constraint new_joe_pk primary key (pk));
Table created.
JSWEETSER@sandbox> desc test1_interim
Name Null? Type
----------------------------------------- -------- ----------------------------
PK NOT NULL NUMBER
COL1 VARCHAR2(30)
JSWEETSER@sandbox> select * from test1_interim;
no rows selected
JSWEETSER@sandbox> exec dbms_redefinition.can_redef_table('JSWEETSER', 'TEST1');
PL/SQL procedure successfully completed.
JSWEETSER@sandbox> exec dbms_redefinition.start_redef_table ('JSWEETSER',
'TEST1', 'TEST1_INTERIM', 'PK PK , to_char(col1) col1');
PL/SQL procedure successfully completed.
JSWEETSER@sandbox> col pk format 99
JSWEETSER@sandbox> col col1 format 999
JSWEETSER@sandbox> select * from test1;
PK COL1
--- ----
1 99
2 200
JSWEETSER@sandbox> select * from test1_interim;
PK
---
COL1
--------------------------------------------------------------------------------
1
99
2
200
JSWEETSER@sandbox> col col1 format a10
JSWEETSER@sandbox> select * from test1_interim;
PK COL1
--- ----------
1 99
2 200
JSWEETSER@sandbox> desc test1
Name Null? Type
----------------------------------------- -------- ----------------------------
PK NOT NULL NUMBER
COL1 NUMBER
JSWEETSER@sandbox> exec dbms_redefinition.finish_redef_table ('JSWEETSER',
'TEST1', 'TEST1_INTERIM');
PL/SQL procedure successfully completed.
JSWEETSER@sandbox> desc test1
Name Null? Type
----------------------------------------- -------- ----------------------------
PK NOT NULL NUMBER
COL1 VARCHAR2(30)
JSWEETSER@sandbox> select * from test1;
PK COL1
--- ----------
1 99
2 200
JSWEETSER@sandbox>
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Guenadi Jilevski
Sent: Friday, June 01, 2012 12:56 PM
To: rui_catcuddler@xxxxxxxxx
Cc: Brian.Zelli@xxxxxxxxxxxxxxx; oracle-l
Subject: Re: changing a column type
Hi,
Correct. Look at the example of dbms_redefinition. It is old but the idea
applies.
http://www.dbspecialists.com/files/presentations/online_redef.html
Regards,
On Fri, Jun 1, 2012 at 9:48 PM, Rui Cat <rui_catcuddler@xxxxxxxxx> wrote:
> As Mark and Tim showed not directly. Maybe looking at the
> dbms_redefinition package might help in this instance.
> Rui
>
>
> ________________________________
> From: "Zelli, Brian" <Brian.Zelli@xxxxxxxxxxxxxxx>
> To: oracle-l <oracle-l@xxxxxxxxxxxxx>
> Sent: Friday, June 1, 2012 1:51:16 PM
> Subject: changing a column type
>
> A colleague wants to change a column type from numeric to alpha-numeric.
> Can he change it with data in it?
>
> ciao,
> Brian
>
> Brian Zelli
> Senior Database Administrator
> Enterprise Applications/Systems Integration
> Roswell Park Cancer Institute
> (716) 845-4460
> brian.zelli@xxxxxxxxxxxxxxx
>
>
>
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