Blog
ORA-01442: column to be modified to NOT NULL is already NOT NULL
No Comments
ORA-01442: column to be modified to NOT NULL is already NOT NULL
Fix / Solution : ORA-01442: column to be modified to NOT NULL is already NOT NULL
When you fire below command, then following error will come If a column having no null values at all in a table. then you can’t add directly ‘NOT NULL’. You can follow below method to add NOT NULL constraint
sql> alter table HR.ADDRESSDETAILS modify UID not null; ORA-01442: column to be modified to NOT NULL is already NOT NULL
Solution:
Syntax:
ALTER TABLE table_name ADD CONSTRAINT constraint_name CHECK(COLUMN_NAME IS NOT NULL);
Example:
ALTER TABLE HR.ADDRESSDETAILS ADD CONSTRAINT nn_uid_hr_addrsdtls CHECK(UID IS NOT NULL) ;