SQL Cheat Sheet for Data Engineers

Stop rewriting the same pipeline queries from scratch every sprint.

This 13-section reference guide covers everything you need — from SELECT basics to window functions, CTEs, and real-world query patterns you'll actually use on the job.


📋 WHAT'S INSIDE

50 essential queries across 13 categories

Every section opens with a plain-English explanation and real-world example

Syntax tips with concrete before/after code examples and Why? explanations

Cross-database reference tables for PostgreSQL, MySQL, SQL Server, BigQuery, Snowflake

Copy-paste ready templates for the most common analysis patterns

Performance cheat sheet — slow patterns and their fast alternatives


📌 SECTIONS COVERED

1. SELECT Fundamentals

2. Filtering with WHERE

3. Aggregation & GROUP BY

4. JOINs — Combining Tables

5. Subqueries & CTEs

6. Window Functions

7. Date & Time Functions

8. String Functions

9. CASE Expressions & NULL Handling

10. UNION & Set Operations

11. Performance Cheat Sheet

12. Real-World Analyst Patterns

13. More Essential Patterns


👤 WHO IT'S FOR

Data engineers, analytics engineers, and dbt developers who write SQL daily for pipelines, transformations, and data quality checks.

📄 FORMAT

Instant PDF download. Clean, professionally designed, and printer-friendly.

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No fluff. No filler. Just the SQL you need.