Power Query Custom Function with Parameter to Get and Transform Multiple CSV Files Data - EMT 1919

Learn to create a custom Power Query function with parameters to import and transform multiple CSV files containing cross-tabulated data into a single, properly structured table. Master the process of building a parameterized custom function that can automatically handle multiple CSV files from a folder, convert cross-tabulated data structures into proper tables, and append them all together. Explore advanced M Code techniques including the From Folder feature, parameter creation, custom function development, two-way M Code lookups, and LET expressions. Discover how to create a sample file for testing, build queries with custom function code, implement the custom function in final queries, and combine multiple tables efficiently. Understand the advantages of using parameters in custom functions for flexibility and scalability, and see how adding new files to a folder automatically updates your data model. Practice editing custom functions and witness the power of parameterization in data transformation workflows through hands-on examples using Seattle Airport data files.