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4. SQL for Data Engineers (Joins, Window Functions)

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Joins + window functions — DE cha daily tool. Easy examples on fictional orders.

What you will learn in this chapter

  • Why DE SQL differs slightly from report-only SQL
  • Joins that explode rows
  • Window functions for running totals
  • Filter early habit
  • Practice

Fictional labs

India retail stories (Raja Traders Nagpur, Mauli Dairy Pune) are fictional. Spark samples are tiny/local — no live cluster claimed.

Concepts in this chapter

  1. 4.1DE SQL Mindset
  2. 4.2Joins That Explode
  3. 4.3Window Functions Lite
  4. 4.4Practice, Tip and Close

The chapter recap is at the end of the last concept page.