We can define coalesce in PowerQuery as the last value existing in a single row of multiple columns positioned from left to right. In our example that would be the last value from the month columns. In this article, we will show you how to create both static and dynamic formulas for coalescing. If you …
In this blog, we will see how to merge two tables in Power Query based on key column and a date range. Merging with multiple matching columns is straightforward and can be achieved in Power Query by selecting merge queries option and holding CTRL key when choosing matching columns like in the picture below:
Let us imagine the following scenario. We have multiple clients sharing their sales data with us. They store the data in dedicated folders that reside in different places. The number of clients, as well as the number of files for each client, will vary across periods. We wish to create an automatic refresh system that …
How to process multiple folders with a single PowerQuery script Read More »
In this article, we will show how to solve a common problem of expanding nested tables or records in Power Query, when the column names of the nested objects vary in numbers. In the second part of the article, we will show a more robust technique for dealing with changing structures of the nested tables. …
Dynamically expand table or record columns in Power Query Read More »
If you ever had a need to check if anything changed in the new table compared to the previous export, no matter in which column, then this is the article for you. We have created an M script in Excel that uses the left anti join to check for data inconsistency. it works with any …
How to track changes in the table in Power Query Read More »
This is going to be an easy-to-follow article on how to use PowerQuery to easily change source data granularity for only a subset of data. We used a client’s request to split packs into its components as an inspiration to write this post. You can also download Excel workbook and follow along. Sometimes in the …
In this blog, we will explain nested functions in Power Query, as well as how to optimize these functions with buffering. By using nested functions and buffering, we will combine most of the advanced M coding. Business Case We will demonstrate the business problem we want to solve with the following snapshot from the Contoso …
Removing top rows is straightforward from within the Power Query user interface and if done only upon one source. The problem arises when we need to remove a dynamic number of top rows from multiple sources and we don’t know the exact number of redundant rows in each source. In this blog post, we will …
In this article, we will explain an advanced topic about the M language – using List.Generate to loop over a table. We will combine our knowledge of lists, records, functions, iterations, and looping techniques. Basically, every important object in PowerQuery. Do-while Loop in PowerQuery Do while loop is commonly used in object programming. The idea …
In this article, we are going to talk about cleaning and transforming column names dynamically and in a bulk. The article was inspired by a request from a client who had issues exporting data from its data warehousing program to .csv files. Out of an unknown reason, program was adding random spaces and non-printable characters …
Using M to dynamically change column names in PowerQuery Read More »
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