PowerQuery Contains Filtering

Reza Rad explains two different methods of filtering which may look similar but can result in quite different outputs:

The script tells the whole story. Despite the fact that you typed in “Dan” and Power Query showed you all FirstNames that has “Dan” in it. the script still use equity filters for every individual FirstName. For this data set there won’t be any issue obviously, because all FirstNames with “Dan” is already selected. However if new data rows coming in to this table in the future, and they have records with FirstNames that are not one of these values, for example Dandy, it won’t be picked! As a result the filter won’t work exactly as you expect. That’s why I say this is misleading.

Read on for notes on how to put the Contains operator to good use.

Related Posts

Power Query and the Benefits of Immutability

Chris Webb explains why immutable expressions can be faster to run multiple times than mutable processes: Instead of taking the value #”Sorted Rows”[Column2]{0} and storing it in the variable Column2 then adding Column2 four times, I’m  adding the expression #”Sorted Rows”[Column2]{0} together four times. The query returns the same number as the previous query. However […]

Read More

The Importance of Interaction in Power BI

Marc Lelijveld continues a series on storytelling with Power BI: Many times, I see reports with loads of visuals on the pages. This results in both a really poor performance, as well as the end user has no clue what the key message is of this report. You can always ask yourself, is this visual […]

Read More

Categories

December 2016
MTWTFSS
« Nov Jan »
 1234
567891011
12131415161718
19202122232425
262728293031