- 02 Nov, 2021
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ORA-01442: column to be modified to NOT NULL is already NOT NULL
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
1 2 3 | sql> alter table HR.ADDRESSDETAILS modify UID not null;ORA-01442: column to be modified to NOT NULL is already NOT NULL |
Solution:
Syntax:
1 | ALTER TABLE table_name ADD CONSTRAINT constraint_name CHECK(COLUMN_NAME IS NOT NULL); |
Example:
1 | ALTER TABLE HR.ADDRESSDETAILS ADD CONSTRAINT nn_uid_hr_addrsdtls CHECK(UID IS NOT NULL) ; |