SQL · interview question
What assumption should be made explicit when working with joins?
Multiple choiceMediumchapter-11-curatedpremiumsqljoins
Answer and explanation
Correct answer
A. The expected data shape, boundary rule, or invariant that the rest of the code depends on staying true.
Why
Once assumptions are explicit, bugs are easier to detect and test cases are easier to design.
Test yourself on SQL
A free test with instant, explained results. No account needed.
More SQL questions
- If you wrote a test around schema thinking, what should the test prove first?
- What do interviewers usually hear as a strong signal when you discuss schema thinking well?
- Which naming or modeling choice is strongest for schema thinking?
- What is the healthiest performance judgment around indexes and access patterns?
- Which option treats joins as an engineering policy decision instead of a syntax trick?
- A senior interviewer asks for one tradeoff behind joins. What is the strongest follow-up?