RE: changing a column type
- From: "Mercadante, Thomas F (LABOR)" <Thomas.Mercadante@xxxxxxxxxxxx>
- To: "Brian.Zelli@xxxxxxxxxxxxxxx" <Brian.Zelli@xxxxxxxxxxxxxxx>, oracle-l <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 4 Jun 2012 08:29:10 -0400
Brian,
Kinda late to the game but here is another way:
Given
Test_table(col1 number(10));
And we want
Test_table(col1 varchar2(10));
Alter table test_table add(new_col1 varchar2(10));
Update test_table
Set new_col1 = col1;
Commit;
-- check the data to make sure it all migrated correctly;
Alter table test_table drop column col1;
Alter table test_table rename column new_col1 to col1;
Hope this helps.
Tom
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Zelli, Brian
Sent: Friday, June 01, 2012 2:49 PM
To: oracle-l
Subject: RE: changing a column type
I thought you would not be able to change it with data in it but he told me he
has in the past. I wasn't so sure......
ciao,
Brian
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Powell, Mark
Sent: Friday, June 01, 2012 2:43 PM
To: oracle-l
Subject: RE: changing a column type
Observe:
MPOWEL01@UT1> create table marktest2 ( fld1 number, fld2 varchar2(30));
Table created.
MPOWEL01@UT1> insert into marktest2 values (1,'something or other');
1 row created.
MPOWEL01@UT1> commit;
Commit complete.
MPOWEL01@UT1> alter table marktest2 modify (fld1 varchar2(10)); alter table
marktest2 modify (fld1 varchar2(10))
*
ERROR at line 1:
ORA-01439: column to be modified must be empty to change datatype
MPOWEL01@UT1>
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Zelli, Brian
Sent: Friday, June 01, 2012 1:51 PM
To: oracle-l
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
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