Apache Derby DB Error Code 42X39 – Subquery is only allowed to return a single column.

Posted by AbundantCode

In this blog post, let’s learn about the error message “42X39- Subquery is only allowed to return a single column.” in Apache Derby Database and the description of the error.

Error Message

42X39- Subquery is only allowed to return a single column.

Error Details

Subquery is only allowed to return a single column.