What are window functions in SQL?

Window functions compute aggregates over a "window" of rows per output row—think running totals or ranks without GROUP BY collapsing your data.

How do recursive CTEs work?

They start with a base case (e.g., top managers), then recursively join to build trees like org charts, handling any depth in one query.

When should I use LATERAL joins?

For top-N per group or row-wise subqueries that reference earlier tables—beats windows for complex per-row computations.

☁️ Cloud & Databases

SQL's Hidden Arsenal: From Windows to Lateral Joins

You know basic SQL. But advanced techniques like window functions and recursive CTEs? They're the difference between good and great analysts. Here's how they work.

theAIcatchup Apr 10, 2026 3 min read

Code snippet of SQL window function query visualizing employee salaries by department

⚡ Key Takeaways

Window functions preserve rows while aggregating—ditch GROUP BY for ranks and running totals. 𝕏
CTEs and recursive CTEs make complex queries readable and hierarchical traversal effortless. 𝕏
LATERAL joins enable top-N per group; FILTER cleans conditional aggregates. 𝕏

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Originally reported by Dev.to

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