Data preparation

Power BI Section

Power BI Section

Overview

Power Query in Power BI allows users to transform and clean their data with ease. The user-friendly interface and robust functionalities make it ideal for preparing data for analysis.

Key Features

  • Data transformation (e.g., filtering, sorting, and grouping)
  • Data cleaning (e.g., removing duplicates, handling missing values)
  • Merging and appending queries
  • Pivoting and unpivoting columns
  • Custom column creation using M language
  • Integration with various data sources
  • Parameterization and dynamic data sources
  • Advanced editor for complex transformations
  • Data profiling tools
  • Combining data from multiple files

Examples and Steps

Transforming Data

To transform data in Power Query:

  1. Open Power BI Desktop.
  2. Click on 'Transform data' from the Home ribbon to open Power Query Editor.
  3. Select the table or query you want to transform.
  4. Use the transformation options available in the toolbar (e.g., filter rows, split columns).
  5. Apply the changes by clicking 'Close & Apply'.

Cleaning Data

To clean data in Power Query:

  1. Open Power Query Editor.
  2. Select the column you want to clean.
  3. Use options like 'Remove Duplicates', 'Replace Values', or 'Fill Down' to clean the data.
  4. Review the applied steps in the 'Applied Steps' pane.
  5. Apply the changes by clicking 'Close & Apply'.

Merging Queries

To merge queries in Power Query:

  1. Open Power Query Editor.
  2. Click on 'Merge Queries' in the Home ribbon.
  3. Select the queries you want to merge and define the join type.
  4. Click 'OK' to create the merged query.
  5. Apply the changes by clicking 'Close & Apply'.

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