Beyond Basics: Mastering SQL's LEAD, LAG, RANK, DENSE_RANK, and NTILE

You've learned that window functions exist. You've run a ROW_NUMBER() or two. But there's a whole tier of power hiding just one step further — functions that let you compare rows against their neighbors, assign competition-style rankings, and slice datasets into meaningful percentile buckets. No self-joins. No correlated subqueries. No tears. This article goes deep on five advanced window functions: LEAD, LAG, RANK, DENSE_RANK, and NTILE. Each one solves a specific class of problem you'll hit c...