Apache Derby DB Error Code 42Y22 – Aggregate cannot operate on type . Posted by AbundantCode In this blog post, let’s learn about the error message “42Y22- Aggregate cannot operate on type .” in Apache Derby Database and the description of the error. Error Message 42Y22- Aggregate cannot operate on type . Error Details Aggregate cannot operate on type . Share this:PostLike this:Like Loading... AbundantCode September 17, 2024