Apache Derby DB Error Code 21000 – Scalar subquery is only allowed to return a single row.

Posted by AbundantCode

In this blog post, let’s learn about the error message “21000- Scalar subquery is only allowed to return a single row.” in Apache Derby Database and the description of the error.

Error Message

21000- Scalar subquery is only allowed to return a single row.

Error Details

Scalar subquery is only allowed to return a single row.