SQL · interview question

What is the healthiest performance judgment around schema thinking?

Multiple choiceMediumchapter-11-curatedpremiumsqlschema-thinking

sql

CREATE TABLE orders (
  id TEXT PRIMARY KEY,
  customer_id TEXT NOT NULL,
  subtotal_cents INTEGER NOT NULL
);

Solve the symptom with comments only and avoid changing the code shape around schema thinking.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.Keep schema thinking implicit so the script stays short and hope the next engineer infers the rule.

Answer and explanation

Correct answer

C. Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Why

Premature optimization is usually weaker than targeted optimization backed by measurement.

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What is the healthiest performance judgment around schema thinking?

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