How do I practise for a real SQL interview?

Do it the way the interview actually works. Instead of only reading questions, write and run real queries against a schema in a plain editor and check the output. QueryCase's Career Hub gives you company-style questions with a live SQL editor and a target output, so you build the muscle of turning a business question into a working query rather than just recognising the answer.

Are the SQL interview questions free?

Several are free to solve with no card needed, so you can try the format straight away. The full set, along with the rest of the Career Hub, unlocks with Pro, a one-time payment of GBP 14.99 with no subscription and no recurring charges.

Which companies do the interview questions cover?

The questions are modelled on the kinds of tasks that come up at data teams like Meta, Amazon, Netflix, Google, Airbnb, Spotify, Snapchat, Robinhood, Lyft, Coinbase and Twitter. They are grouped by company so you can focus your prep on the shape of problem a given team tends to ask.

What is MCQ Quickfire?

Quickfire is a rapid multiple-choice mode: hundreds of short questions across SQL, query performance, statistics, A/B testing, Python and pandas, data modelling, business metrics, data quality and the modern data stack. Each answer comes with an instant explanation, so it is the fastest way to find and close gaps in your fundamentals.

Do I need to install a database to practise?

No. Everything runs in your browser using DuckDB compiled to WebAssembly, so there is nothing to install, no account required to start, and no database to configure. You write SQL and it executes locally.

How is this different from reading a list of SQL interview questions?

A list tests recognition; an interview tests whether you can produce a working query under a little pressure. In the Career Hub you actually write the SQL, run it, get it checked against the expected output, and only then see a worked solution plus the insight most candidates miss. That loop is what transfers to the room.

Blog›Introducing the Career Hub: Practice SQL Interviews for Real

CareerSQL Skills

Introducing the Career Hub:
Practice SQL Interviews for Real

A new home for landing the data job: real company-style SQL interview questions, a rapid-fire quiz across the whole data stack, and a map of the roles you are aiming for.

Conor Robertson

July 4, 2026 · 7 min read

Frequently asked questions

The questions that come up most about practising for a SQL interview.

Practice on real company questions

The heart of the Career Hub is a set of interview questions styled after the ones that actually come up on data teams. Each one opens in a real SQL editor: you get the schema, the target output, and a blank query. You write it, run it against an in-browser database, and it checks your answer. Get it right and you unlock a worked solution plus the one insight most candidates miss on that question.

They are grouped by company, so you can prep for the kind of thing a specific team tends to ask. Pick one to see what it tests:

Average Shares Per Post

Meta interview question

Easy

Average shares per post per user, counting users whose posts got zero shares. The trap: joining straight to the shares table double-counts and skips the silent users.

TestsLEFT JOINaggregation

Why company framing matters

The SQL is the same everywhere, but the trap changes. Netflix leans on rolling windows, Amazon on multi-table joins and COUNT(DISTINCT), Robinhood on the anti-join. Practising a question the way a real team frames it is the difference between "I know JOINs" and "I have solved this exact shape of problem before."

You are not just ticking a box when you get one right. Every question ships with the reasoning: why the naive version double-counts, why "at least" means >= and not >, why a rolling average belongs at the series grain and not the episode. That is the part that actually transfers to the room.

Warm up with Quickfire

The long questions are where you prove you can build a query. But most interviews also poke at the fundamentals along the way: does this return NULL or false, what does COUNT quietly ignore, does RANK skip after a tie. Those are the moments you cannot afford to stall on.

MCQ Quickfire is built for exactly those: hundreds of them, rapid fire, with an instant explanation on every answer. Here are three to try right now.

Quickfire

0 correct

The staff table has 5 rows, and 2 of them have a NULL bonus. What does this return?

SELECT COUNT(*), COUNT(bonus)
FROM staff;

What it drills

Introducing the Career Hub:
Practice SQL Interviews for Real

Frequently asked questions

Practice on real questions before the interview.

Practice on real company questions

Warm up with Quickfire

Know the role you are aiming for

How to actually use it