When someone can’t answer an interview question about relational databases, it might be that they don’t know anything about relational databases.
I thought you all were better than this. Why are you asking questions about relational databases? Why not just have candidates accomplish the thing you're assessing with an actual relational database? I know you're work-sample-literate! But if your feedback emphasizes communication, doesn't that imply a lot about your process is subjective? After all, and to extend an analysis used in this blog post: it could be that the candidates couldn't effectively communicate knowledge about RDMBS's. Or, it could be that the interviewer wasn't effectively listening to what the candidate was saying.
I thought you all were better than this. Why are you asking questions about relational databases? Why not just have candidates accomplish the thing you're assessing with an actual relational database? I know you're work-sample-literate! But if your feedback emphasizes communication, doesn't that imply a lot about your process is subjective? After all, and to extend an analysis used in this blog post: it could be that the candidates couldn't effectively communicate knowledge about RDMBS's. Or, it could be that the interviewer wasn't effectively listening to what the candidate was saying.