SQL Interview Question | Gaps and Islands Explained Step by Step

In this video, we break down one of the most common SQL interview patterns: Gaps and Islands. We solve a consecutive login streak problem step by step and explain the thinking behind the solution using: - ROW_NUMBER() - CTEs - Consecutive date grouping - Aggregations - Streak calculations Topics covered: • SQL Interview Preparation • Gaps and Islands Pattern • Consecutive Dates in SQL • ROW_NUMBER() • Window Functions • CTEs • SQL Problem Solving The goal is not just to memorize the solution, but to understand the pattern behind these interview questions. Code. Query. Crack.