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convert clob to varchar2 datatype

Posted on 2014-10-08
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Last Modified: 2014-10-09
Hi ,

I have a table called comments , in which I have converted the column data type from varchar2 to clob , as provided in the solution  mentioned below.

http://www.experts-exchange.com/Database/Oracle/Q_28524807.html

I need to create an rollback script which will modify the comments  column from CLOB to Varchar2 and the data to be stored in  USER_TAB tablespace . from USERS_LOB tablespace.

Any help is really appreciated.
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Question by:sam_2012
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 40369091
Just use SUBSTR on the CLOB column. You should get a varcahr2 result.

create table rollback_table as (select substr(comments,1,4000) from clob_table);
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Author Comment

by:sam_2012
ID: 40371241
Is it possible to change the column data type from CLOB to VARCHAR2 using alter table command for global temporary table.
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Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 40371357
Set up a dev/test database and try it?

Doesn't work for me...
create global temporary table gt_junk
(
	col1 clob
) on commit preserve rows
/

alter table gt_junk modify col1 varchar2(4000);

Open in new window


That said:
It is a temporary table. Any reason you cannot just drop and recreate it?
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Author Comment

by:sam_2012
ID: 40371517
I have dropped and re-created it , since it is an global temporary table.
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Author Closing Comment

by:sam_2012
ID: 40371518
Thanks.
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