ORA-01442 Error Message
Learn the cause and how to resolve the ORA-01442 error message in Oracle.
Description
When you encounter an ORA-01442 error, the following error message will appear:
- ORA-01442: column to be modified to NOT NULL is already NOT NULL
Cause
You tried to execute a ALTER TABLE MODIFY statement to change a column to NOT NULL, but the column is already set to NOT NULL.
Resolution
The option(s) to resolve this Oracle error are:
Option #1
The ALTER TABLE statement is unnecessary since your column is already set to NOT NULL.
For example, if you had a table called suppliers defined as follows:
CREATE TABLE suppliers ( supplier_id number(5) NOT NULL, supplier_name char(100) );
And you tried to execute the following ALTER TABLE statement:
ALTER TABLE suppliers MODIFY supplier_id NOT NULL;
You would receive the following error message:
There is no remedy for this error since your table definition is identical to your ALTER TABLE statement.
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