In this blog post, let’s learn about the error message “284 A subquery has returned not exactly one row.” in Hydra and the description of the error.
Error Message
284 A subquery has returned not exactly one row.
Error Details
Inspect the current statement, examining the punctuation of all quoted strings. To include the quote character in a literal string, use single apostrophes as string delimiters, as in the following example:
SELECT “, fname,”, “””, lname, “”” FROM customer