ORA-01400: cannot insert NULL into

I got ” ORA-01400: cannot insert NULL into ” error in Oracle.


ORA-01400: cannot insert NULL into


Details of error are as follows.

ORA-01400: cannot insert NULL into (string)

Cause: An attempt was made to insert a NULL into the column "USER"."TABLE"."COLUMN".

For example, if you enter:

connect scott/tiger create table a (a1 number not null); insert into a values (null);
Oracle returns:

ORA-01400 cannot insert NULL into ("SCOTT"."A"."A1") : which means you cannot insert NULL into "SCOTT"."A"."A1".

Action: Retry the operation with a value other than NULL

To see if a table allows NULL values, use tthe SQL*Plus desc command on the table name:



cannot insert NULL into

This ORA-01400 errors are related with the NULL value for the not null or primary key columns.


For example; I have created test table and id column has NOT NULL constraint as follows.

CREATE TABLE ora_1400_error
name VARCHAR2(100)


When you insert any NULL value, you will get this error.

INSERT INTO ora_1400_error
'Ora-01400 error');

ORA-01400: cannot insert NULL into ID


You need to insert any not null value to this column as follows.

INSERT INTO ora_1400_error
'Ora-01400 error');


Or you can drop or disable this NOT NULL Constraint to solve this error.

You can find the constraint of table as follows.

SQL> select a.constraint_name, b.status from user_cons_columns a inner join user_constraints b on a.constraint_name = b.constraint_name where a.table_name = 'ORA_1400_ERROR' and a.column_name = 'ID';

------------------------- --------


You can disable the constraint as follows.


SQL> alter table ORA_1400_ERROR disable constraint SYS_C006334 ;

Table altered.



Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )


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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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