Apache Derby DB Error Code 42Z20 – Column ‘‘ cannot be made nullable. It is part of

Posted by AbundantCode

In this blog post, let’s learn about the error message “42Z20- Column ‘‘ cannot be made nullable. It is part of” in Apache Derby Database and the description of the error.

Error Message

42Z20- Column ‘‘ cannot be made nullable. It is part of

Error Details

Column ‘‘ cannot be made nullable. It is part of a primary key or unique constraint, which cannot have any nullable columns.