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You're reading from  Expert Data Modeling with Power BI - Second Edition

Product typeBook
Published inApr 2023
PublisherPackt
ISBN-139781803246246
Edition2nd Edition
Concepts
Business Intelligence
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Author (1)
Soheil Bakhshi
Soheil Bakhshi
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Soheil Bakhshi

Soheil Bakhshi is the founder of Data Vizioner and is a sought after BI consultant. Working in data and analytics for more than 20 years, Soheil's experience lies in Microsoft BI, Data Warehousing, and Power BI platform. He possesses MSCE, MCSA certifications and is a Microsoft MVP (Most Valuable Professional). He has a passion for sharing knowledge via his website and speaking at conferences and Power BI community events locally and globally. In following his desire for simplicity and efficiency, he is behind Power BI community tools and commercial products such as Power BI Exporter and Power BI Documenter.
Read more about Soheil Bakhshi

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Merging queries

Another common data transformation operation is merging queries. The merge queries functionality is useful when you want to denormalize snowflakes absorbing the data stored in different tables into one table. When using the UI in Power Query, depending on the selected matching type, Power Query uses one of the following functions behind the scenes:

  • Table.NestedJoin()
  • Table.FuzzyNestedJoin()

The following image shows the relevant UI:

Figure 5.43: Merging queries via the UI uses different Power Query functions, depending on the matching type

If we do not tick the Use fuzzy matching to perform the merge box, Power Query generates the following function:

Table.NestedJoin(
	FirstTable as table
	, KeyColumnofFirstTable as any
	, SecondTable as any
	, KeyColumnofSecondTable as any
	, NewColumnName as text
	, optional JoinKind as nullable JoinKind.Type
	)

Otherwise, Power Query generates the following:

Table.FuzzyNestedJoin...
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Expert Data Modeling with Power BI - Second Edition
Published in: Apr 2023Publisher: PacktISBN-13: 9781803246246
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Soheil Bakhshi

Soheil Bakhshi is the founder of Data Vizioner and is a sought after BI consultant. Working in data and analytics for more than 20 years, Soheil's experience lies in Microsoft BI, Data Warehousing, and Power BI platform. He possesses MSCE, MCSA certifications and is a Microsoft MVP (Most Valuable Professional). He has a passion for sharing knowledge via his website and speaking at conferences and Power BI community events locally and globally. In following his desire for simplicity and efficiency, he is behind Power BI community tools and commercial products such as Power BI Exporter and Power BI Documenter.
Read more about Soheil Bakhshi

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