RE: Null data in not null column
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <oratune@xxxxxxxxx>, <howard.latham@xxxxxxxxx>, <giantpanda@xxxxxxx>, "'ORACLE-L'" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 15 Apr 2014 14:03:41 -0400
Likely David is correct.
If in the sqlplus session reporting the data you preface the query with
set null ~
then the columns containing actual nulls will be definitively displayed
visually.
also, your query has a column header of length(ANZEIGE_NAME),
but that is NOT the query you ran.
Please clear up this fishiness.
mwf
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of David Fitzjarrell
Sent: Tuesday, April 15, 2014 1:28 PM
To: howard.latham@xxxxxxxxx; giantpanda@xxxxxxx; ORACLE-L
Subject: Re: Null data in not null column
SQL> insert into emp(empno) values ("");
ERROR:
ORA-01741: illegal zero-length identifier
SQL>
SQL>
SQL>
SQL>
SQL> insert into emp(empno) values ('');
insert into emp(empno) values ('')
*
ERROR at line 1:
ORA-01400: cannot insert NULL into ("GRIBNAUT"."EMP"."EMPNO")
SQL>
TJ is correct, the NOT NULL constraint was added after the NULL values were
entered; it was created NOVALIDATE so it wouldn't fail on creation due to
the existing NULL values. It's possible to disable the constraint on the
source table before the export then enable it novalidate in the destination
database after the table has been imported. Of course you would also need
to enable the constraint novalidate in the source database after the export
has completed.
David Fitzjarrell
Primary author, "Oracle Exadata Survival Guide"
On Tuesday, April 15, 2014 11:13 AM, "howard.latham@xxxxxxxxx"
<howard.latham@xxxxxxxxx> wrote:
Set it to ""
----- Reply message -----
From: "Ingrid Voigt" <giantpanda@xxxxxxx>
To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
Subject: Null data in not null column
Date: Tue, Apr 15, 2014 4:53 PM
Hi,
one of our customers' databases has a table with a not null column
containing empty data.
Do you know how this can be set up?
I need to copy the table (via exp/imp) and hit either ORA-01400 (when
defining not null
before insert) or ORA-02296 (when I insert first and later modify the
column).
More details:
Windows 2008 R2
Oracle 11.2.0.3 + Patch 27 (January 2014)
Table definition (more columns left out):
CREATE TABLE USR_USER
(
OID NUMBER(15) NOT NULL,
ANZEIGE_NAME VARCHAR2(40 BYTE) DEFAULT ''
NOT NULL,
)
TABLESPACE USERS;
And the data:
> select oid, anzeige_name, '.'||anzeige_name||'.' from usr_user;
OID ANZEIGE_NAME LENGTH(ANZEIGE_NAME)
---------- ---------------------------------------- --------------------
223
224
(more rows left out)
These are not strings consisting of spaces, but really empty ones, i.e.
nulls.
Insert into the table without specifying anzeige_name also hits ORA-01400,
the condition
is active. The corresponding check constraint is enabled and validated.
I'd appreciate help in reproducing this.
Thank you.
Ingrid Voigt
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