Please walk me through the differences between JOIN and UNION?

This is yet another question asking you to compare and contrast two technical terms. During a back end developer job interview, interviewers will ask you technical, operational, behavioral, and general questions. While they often start with general questions and sometimes end with behavioral questions, they can use all these types of questions throughout the interview. No two interviewers are alike, so you cannot anticipate the types of questions you will be asked and when they will be asked. The best way to perform well during an interview is to carefully listen to the question, provide the interviewer with an answer in clear and easy-to-understand language, and be prepared for follow-up questions used to explore the topic in more detail.