SQL Interview Question For Data Analyst | Remove Duplicates Using SQL | CTE + Window Function

Published: 13 August 2025
on channel: Tuning Data

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In this video, we tackle a real SQL interview question that tests your knowledge of CTE (Common Table Expressions), Window Functions, and removing duplicates. This is a practical, hands-on example you might face in data analyst or business analyst interviews.

We’ll go step-by-step, from understanding the problem to writing an optimized SQL query that solves it. You’ll learn:

How to use CTEs in SQL for better query readability

How Window Functions work and when to use them

Different methods to find and remove duplicate records in a table

Best practices for SQL interview questions

How to apply this in PostgreSQL (works in other SQL databases too)

If you’re preparing for SQL interviews or want to master advanced SQL techniques, this tutorial will help you boost your skills and confidence.

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#sql #postgresql #sqlinterview #dataanalyst #sqltutorial

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