How to resolve ORA-01400 Error Message in Oracle database

Learn the purpose and how to get to the bottom of the ORA-01400 error message in Oracle.

Description

When you stumble upon an ORA-01400 error, the following error message will appear:

ORA-01400: can’t insert NULL into (“SCHEMA”.”TABLE_NAME”.”COLUMN_NAME”)

Cause

You tried to insert a NULL value into a column that does not receive NULL values.

Resolution

The option(s) to resolve this Oracle error are:

Option #1

Correct your INSERT declaration so that you do not insert a NULL price into a column that is defined as NOT NULL.

For example, if you had a table referred to as suppliers defined as follows:

CREATE TABLE suppliers
( supplier_id number not null,
  supplier_name varchar2(50) not null );

And you tried to execute the following INSERT statement:

INSERT INTO suppliers
( supplier_id )
VALUES
( 10023 );

You would receive the following error message:

You have described the supplier_name column as a NOT NULL field. Yet, you have attempted to insert a NULL value into this field.

You should right this error with the following INSERT statement:

INSERT INTO suppliers
( supplier_id, supplier_name )
VALUES
( 10023, 'IBM' );

Now, you are inserting a NOT NULL fee into the supplier_name column.