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Cheatsheets

Quick-reference cards across every tool and topic. Bookmark this page — it's built to be opened mid-work when you need a fast answer.

⚡Kafka🔥Spark🗃️SQL🏗️System Design🐍Python☁️Cloud🧩DSA🤖AI / LLMs
sql

SQL Cheatsheet — Window Functions, Joins, Optimization

The most important SQL patterns for data engineers — window functions, CTEs, joins, aggregations, and query optimization.

How cheatsheets work on withsoon

Cheatsheets aren't a separate section — they live inside each topic (Kafka, Spark, SQL, etc.) and automatically appear here too. When you're in Big Data → Kafka, you'll find the Kafka CLI cheatsheet. When you search here, you get everything in one place. New cheatsheets are added alongside every deep-dive guide.