Updating a CLOB field

Good morning.
I have a table....
Table1
ID CLOBTXT
123 null
456 Testing Text
I want to update the CLOB field in row 123 with the clob field from 456. For some reason I am unable to update it. I can insert the data from 456 into another table so I know it is reading it but I just cant update the 123 row.
Any ideas? I am new to CLOB and am trying to learn about how to handle them.
Thanks

Can you be more specific about the Oracle version and the SQL you are using, and the error message you receive?
I just tried this simple test with no problems:
Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
SQL> CREATE TABLE t (id NUMBER(3), clobtxt CLOB);
Table created.
SQL> INSERT INTO t VALUES (123, NULL);
1 row created.
SQL> INSERT INTO t VALUES (456, 'Testing text');
1 row created.
SQL> COMMIT;
Commit complete.
SQL> SELECT * FROM t;
        ID
CLOBTXT
       123
       456
Testing text
SQL> UPDATE t
2     SET clobtxt = (SELECT clobtxt FROM t WHERE id = 456)
3   WHERE id = 123;
1 row updated.
SQL> COMMIT;
Commit complete.
SQL> SELECT * FROM t;
        ID
CLOBTXT
       123
Testing text
       456
Testing text
SQL>

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Maybe, Not a neat way to do things, but seems to work.
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ORA-20100:
ORA-06512: at "SYS.DBMS_LOB", line 789
ORA-06512: at line 6
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2619178     0C00070028000000     START                  AAAAAAAAAAAAAAAAAA     set transaction read write
2619178     0C00070028000000     INSERT     TESTTABLE     AAAAAAAAAAAAAAAAAA     insert into "DEVUSER"."TESTTABLE" ...
2619178     0C00070028000000     UPDATE     TESTTABLE     AAAFEXAABAAALEJAAB     update "DEVUSER"."TESTTABLE" set "DESCRIPTION" = NULL ...
2619178     0C00070028000000     COMMIT                  AAAAAAAAAAAAAAAAAA     commitEdited by: 958701 on Sep 12, 2012 9:05 AM
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I am inserting into the table over a database link.
I am using the new version of HTML Db (2.0)
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Regards,
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937670 wrote:
1291012455 represents a date value,What date value does it represent? Since it's not obvious to us what date you want that converted into, it's obviously hard for us to help. For example, perhaps you want that to be Jan 29, 2010 with "12455" representing a time component in some non-obvious format. Perhaps you want that to be December 1991 at 1:24:55. Perhaps you want to convert it to a completely different date. You're going to need to tell us in words how to convert your numeric data into a date.
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