It means that a subquery which is supposed to return only one row is returning multiple rows due to the presence of multiple OR conditions in the query.
Single-Row Subquery Returns More Than One Row
When working with SQL queries, you may have come across the error message "Single-row subquery returns more than one row". This error occurs when you use a subquery to retrieve data, but the subquery returns multiple rows instead of the expected single row. In this article, we will explore the reasons why this error occurs and how to fix it.