NULL in not null column

Question

Hi,
I have a table
SQL> desc tabula.M$$USERS;
Name Null? Type
USERLOGIN NOT NULL VARCHAR2(20)
PASSWORD NOT NULL VARCHAR2(30)
T$USER NOT NULL NUMBER(38)
USERNAME NOT NULL VARCHAR2(30)
USERID NOT NULL NUMBER(38)
USERGROUP NOT NULL NUMBER(38)
T$LINKID NOT NULL VARCHAR2(50)
password column is not null.
Application get ORA-01400 (can't insert to null into not null colum) and also when I run -
Edited by: user10237262 on Nov 29, 2011 12:54 AM

Answer 1

Hi welcome to forum
see below example
SQL> create table t(empno number(4) not null, ename varchar2(10))
  2  /
Table created.
SQL> insert into t values(100,'abc');
1 row created.
SQL> insert into t values(200,'def');
1 row created.
SQL> insert into t values(null,'def');
insert into t values(null,'def')
ERROR at line 1:
ORA-01400: cannot insert NULL into ("SYSTEM"."T"."EMPNO")
SQL> desc t
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
SQL>"Null?" tells the perticular column is null or not...
Usage
The description for tables, views, types and synonyms contains the following information:
each column's name
whether or not null values are allowed (NULL or NOT NULL) for each column
refer:
http://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12019.htm
Edited by: newbie on Nov 29, 2011 12:54 AM