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Row Index and Key Match Lookup in Power Query/ M

This offers techniques to retrieve and manipulate data based on specific row indexes or key matches, enhancing the flexibility and precision of data analysis.
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The M engine can generate different code when drilling down into a value of a table. When that table has primary keys, it applies Key Match Lookup whereas without primary keys it uses Row Index Lookup. Examples are easy to find, just examine the M code for a ‘Navigation’ step in one of your queries.


What’s the difference? Well compare this:

Source{0}[Content]


To this:

Source{[Item="Sheet2",Kind="Sheet"]}[Data]


Exploring Row Index and Key Match Lookup in Power Query/M provides powerful methods for retrieving and manipulating data based on specific row indexes or key matches. These techniques increase precision in data analysis by enabling users to target specific rows or keys, thereby managing large datasets more effectively. 


As a result, data analysts like you can tailor their queries more efficiently, increasing the overall accuracy and relevancy of the data retrieved.

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