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6. Power Query Essentials

Come on, friends, today we learn Power Query – the most powerful part of Power BI. Cleaning data, shaping it, and running those steps automatically on every refresh all happen here. In this module we make the basics strong: the editor, Applied Steps, data types, the M language and query folding (handing the work to the source database).

What you will learn in this module

  • The Power Query Editor layout, ribbon tabs and panes
  • Managing Applied Steps and understanding query dependencies
  • Data types (basics) – detailed type fixing is in Module 7
  • Reference vs Duplicate, parameters and an introduction to M
  • Query folding, Close & Apply and Enable load

Live story: The messy Pune export

Suppose the Blinkit Pune export arrives every morning with a title row, a blank row and amounts typed as text. If we fix it by hand in Excel, we must fix it again tomorrow. Power Query records each fix as a step and repeats it on every refresh. This chapter opens the Power Query Editor and shows Applied Steps, data types, M code and query folding.

All numbers in this story are fictional practice data.

Module 7 (Data Cleaning A–Z) and Module 8 (Add Column) build on this module. Read this one first.

Concepts in this chapter

  1. 6.1What is Power Query?
  2. 6.2Power Query Editor Tour
  3. 6.3The Power Query Ribbon at a Glance
  4. 6.4Applied Steps
  5. 6.5Data Types
  6. 6.6Reference vs Duplicate
  7. 6.7Query Dependencies
  8. 6.8Parameters (Overview)
  9. 6.9Introduction to the M Language
  10. 6.10Query Folding
  11. 6.11Close & Apply and Enable Load

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

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