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

AbundantCode 5 days ago in Apache Derby 0

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.

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