PostgresDB 22004: Null Value Not Allowed

What is PostgresDB 22004: Null Value Not Allowed

Identify the query that caused the error by checking application logs or the PostgreSQL log. Look for any INSERT or UPDATE commands that were executed just before the error occurred.Once you have identified the query, check the table schema to identify the column that does not allow null values. You can do this by running:

\d+ your_table_name

Replace your_table_name with the name of the table you're investigating. Look for columns that are marked as not null.

Review the offending query to see if it explicitly sets a value for all columns that are marked as not null. If any such column is missing from the query, that's likely the cause of the error.If the query includes all not null columns, the issue might be with a null value being passed for one of those columns. Verify the values being inserted/updated, especially if they are coming from user input or an external source.To correct the error, modify the query to ensure that all columns marked as not null are provided with a non-null value. If using a programming language to construct the query, check the code to ensure that variables or parameters used for those columns are not null.If the application logic allows, you can consider setting a default value for the column that is causing the issue. This can be done using:

ALTER TABLE your_table_name ALTER COLUMN column_name SET DEFAULT 'default_value';

Replace your_table_name, column_name, and 'default_value' with the actual table name, column name, and default value you wish to set, respectively.

After making the necessary adjustments, re-run the query to confirm that the error is resolved.If the issue persists, consider checking for triggers that might be modifying the data and leading to a null value insertion/update. Investigate the trigger function logic by running:

SELECT pg_get_functiondef('your_trigger_function_name'::regproc);

Replace your_trigger_function_name with the name of the trigger function you wish to investigate.