Learn the cause and how to resolve the ORA-01400 error message in Oracle.
When you encounter an ORA-01400 error, the following error message will appear:
You tried to insert a NULL value into a column that does not accept NULL values.
The option(s) to resolve this Oracle error are:
Correct your INSERT statement so that you do not insert a NULL value into a column that is defined as NOT NULL.
For example, if you had a table called 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 defined the supplier_name column as a NOT NULL field. Yet, you have attempted to insert a NULL value into this field.
You could correct this error with the following INSERT statement:
INSERT INTO suppliers ( supplier_id, supplier_name ) VALUES ( 10023, 'IBM' );
Now, you are inserting a NOT NULL value into the supplier_name column.