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

As a certified and experienced Oracle Database Administrator with Almost 12 Years of Experience I am able to perform all levels of database maintenance and am fully qualified to do Oracle updates as well. Capitalizing on my interest in Business & IT both, I chose to navigate my career towards Enterprise Solutions, which has enabled me to excel in the combination of both. I have developed exceptional analytical skills that allow me to diagnose and take care of issues immediately. Extremely skilled in planning and execution of special projects in time- critical environments. Extensive knowledge in directing, coordinating and exercising concern authority for planning, organization, control and successful completions. Very skilled at solving customer relations issues by seeking first to understand and then to be understood. Effectively able to communicate with customers, vendors and management.

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