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Interview Questions Guides & Tutorials
Curated interview question banks with answers — SQL, Python, data science, Spark, Power BI, AWS, ADF and more.
Interview Questions articles
Deep Learning Interview Questions and Answers
Deep learning interviews probe whether you can make training work and recognise when it fails. Six questions are answered by training a small PyTorch network on 13,611 real bean measurements, then breaking it on purpose: unscaled inputs, bad learning rates, overfitting, dropout left on, and gradients never cleared.
Scenario-Based SQL Interview Questions
Scenario questions give you a business problem instead of a SQL topic, and the data usually hides a trap. These eight scenarios are solved on a year of real online retail orders, with real traps: duplicate lines, a partial final month, missing customer IDs and a huge order cancelled twelve minutes later.
Python Coding Interview Questions and Patterns
Most Python coding interview questions are one of a handful of patterns in disguise. Seven of them, hash map, sliding window, two pointers, heap, monotonic stack, binary search and interval merging, are solved here on two years of real bike-share data with the standard library, and checked against brute force.
Window Functions SQL Interview Questions
Interviewers use window functions to see whether you understand how SQL evaluates a query, not just the syntax. These nine questions, each answered with a query run on two years of real bike rentals, cover ranking ties, top N per group, running totals, the default frame trap, gaps and islands, and filtering.
SQL Joins Interview Questions Explained
Join questions in interviews are rarely about syntax. They test whether you can predict how many rows come back. These nine questions, each answered with a query on three million real New York taxi trips, cover anti-joins, ON versus WHERE, NOT IN with NULLs, fan-out, self-joins, calendars and full outer joins.
Tableau Interview Questions and Answers
Tableau interviews return to one topic more than any other: when each calculation happens. This guide answers the core questions on FIXED, INCLUDE and table calculations, with the Tableau formulas and their results reproduced on a year of real online orders: one filter, two answers, 100% or 2.57%.