Question

I want to collect the nullable fields from the db, is there any script which can help me ?
It is important to know which fields must be checked against null during the programming.

Thanks in advance.

Cs

Answer 1

SELECT * FROM USER_CONSTRAINTS
where constraint_type = 'C' 

or, more precisely:

select owner, constraint_name, table_name, column_name 
from all_cons_columns

UPDATE:To get nullable columns:

SELECT OWNER, TABLE_NAME, COLUMN_NAME 
FROM ALL_TAB_COLS
MINUS
SELECT OWNER, TABLE_NAME, COLUMN_NAME 
from all_cons_columns