SQL · interview question

If you wrote a test around indexes and access patterns, what should the test prove first?

Multiple choiceHardchapter-11-curatedpremiumsqlindexes-and-access-patterns

sql

CREATE INDEX idx_orders_customer_id ON orders(customer_id);

Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep indexes and access patterns implicit so the script stays short and hope the next engineer infers the rule.Solve the symptom with comments only and avoid changing the code shape around indexes and access patterns.That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Answer and explanation

Correct answer

D. That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Why

Good tests make the design safer to change because they lock in the meaningful behavior rather than surface-level implementation details.

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If you wrote a test around indexes and access patterns, what should the test prove first?

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