Home / Errors/Workarounds10g / 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 

ERROR

Solution : ORA-01442: column to be modified to NOT NULL is already NOT NULL

sql> alter table HR.employees modify UID not null;

ORA-01442: column to be modified to NOT NULL is already NOT NULL

SOLUTION

ALTER TABLE table_name 
  ADD CONSTRAINT constraint_name CHECK(column_name IS NOT NULL); 

OR

ALTER TABLE hr.employees 
  ADD CONSTRAINT nn_uid_hr_addrsdtls CHECK(UID IS NOT NULL); 

About Syed Saad Ali

With 13 years of experience as a certified and skilled Oracle Database Administrator, I possess the expertise to handle various levels of database maintenance tasks and proficiently perform Oracle updates. Throughout my career, I have honed my analytical abilities, enabling me to swiftly diagnose and resolve issues as they arise. I excel in planning and executing special projects within time-sensitive environments, showcasing exceptional organizational and time management skills. My extensive knowledge encompasses directing, coordinating, and exercising authoritative control over all aspects of planning, organization, and successful project completions. Additionally, I have a strong aptitude for resolving customer relations matters by prioritizing understanding and effective communication. I am adept at interacting with customers, vendors, and management, ensuring seamless communication and fostering positive relationships.

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