Ora-01400: Cannot Insert Null Into (Resolved)

The error "ora-01400: cannot insert null into" occurs when an INSERT statement attempts to insert a NULL value into a column that does not allow NULL values. The solution to this error is to either modify the column to allow NULL values or provide a non-NULL value for the column in the INSERT statement.

Here's the general syntax to modify a column to allow NULL values in Oracle:

ALTER TABLE table_name MODIFY column_name NULL;

And here's an example of an INSERT statement that provides a non-NULL value for a column that does not allow NULL values:

INSERT INTO table_name (column1, column2, column3)
VALUES ('value1', 'value2', 'value3');

If you want to avoid the error in future insert statements, you can also add a NOT NULL constraint to the column. This constraint ensures that the column cannot contain NULL values:

ALTER TABLE table_name
MODIFY column_name data_type NOT NULL;

In summary, the "ora-01400: cannot insert null into" error can be resolved by either allowing NULL values in the column, providing a non-NULL value in the INSERT statement, or adding a NOT NULL constraint to the column.

ORA-01400: cannot insert null into (string) Solution

Have you gotten the “ORA-01400: cannot insert null into (string)” error? Learn what causes this and how to resolve it in this article.

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Frequently Asked Questions About The Error

What does the "ora-01400: cannot insert null into" error mean?

The error means that an INSERT statement is attempting to insert a NULL value into a column that does not allow NULL values.

Why is the error occurring?

The error is occurring because the database design specifies that the column cannot contain NULL values, but the INSERT statement is trying to insert a NULL value into that column.

How can I resolve the error?

You can resolve the error by either modifying the column to allow NULL values, providing a non-NULL value in the INSERT statement, or adding a NOT NULL constraint to the column.

Can I ignore the error and continue with the INSERT statement?

No, the error will prevent the INSERT statement from executing. You must resolve the error before the INSERT statement can be executed successfully.

Can the "ora-01400: cannot insert null into" error occur with UPDATE statements?

Yes, the same error can occur with UPDATE statements if an UPDATE statement attempts to update a column with a NULL value and the column does not allow NULL values.

Is it possible to insert NULL values into all columns?

No, it is not possible to insert NULL values into all columns. Each column may have different constraints and requirements, and some columns may not allow NULL values.