Common Primary key vs unique key? interview questions at all levels level with concise answers and code where helpful.

Questions and Answers

Primary key vs unique key?

Detailed answer to: Primary key vs unique key?

Best Practices

  • Explain your thought process aloud during interviews
  • Start with brute force, then optimize — interviewers value progression
  • Discuss time and space complexity for algorithm questions
  • Relate answers to real projects when possible