Database interview questions for backend engineers

<p>Most people study for backend interviews by reading system design books and trying to memorize architectures. They learn to draw boxes labeled Database and Cache.</p> <p>That

<p>You are not being interviewed as a security engineer. You are being checked for one habit: whether, while describing a system, you notice who could abuse it.</p> <p>Security

<p>Most candidates don’t fail data engineering interviews because of SQL or Python; they fail because they can’t connect everything together under pressure.</p> <p>If you’ve ever

<p><em>B-tree internals, column order and planner statistics in Postgres 19, checked against MongoDB's ESR rule.</em></p> <p>Most "add an index" advice stops at <code>CREATE