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Dev tools · July 1, 2020

SQLPad - Prepare SQL Interview Online

Master SQL interview skills in weeks, say goodbye to nerves.

SQLPad - Prepare SQL Interview Online launched on July 1, 2020 with 6 votes, #1,390 of 4,305 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 6 years on.

Visit sqlpad.io ↗Alternatives

What it does

SQLPad is an online SQL playground to prepare your next data scientist SQL interviews. You can learn or refresh SQL skills all in a browser. There are 80 curated SQL interview questions, start practicing them and land your dream data scientist job.

Practice SQL, Python, and R with real interview questions, structured tracks, and hands-on playgrounds designed for data roles.

Structured practice, realistic datasets, and focused execution loops to help you perform with clarity in technical interviews. Run SQL, Python, or R directly on this page. You can practice this sample without logging in. This query selects a user (aliasing it as "user_id") who has the most distinct accepted requests with other users. To do this, it starts by creating a subquery that combines the sender and recipient IDs from the "accepted_request" table. It does this twice, once for each direction of the request (sender to recipient and recipient to sender). This is done using the UNION operator. The resulting table is then grouped by the "user_id_1" column (which contains the user ID from…from sqlpad.io

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