Top 10 Tricky DAX Functions You Need to Know Here are ten DAX functions that can be challenging to understand: CALCULATE : Changes the context in which data is evaluated. FILTER : Applies a filter to a table based on a given condition. EARLIER : Allows access to an earlier row context in nested calculations. VAR : Defines variables for use within DAX expressions. SUMX : Iterates over a table and sums values based on an expression. RELATED : Fetches related data from another table. ALL : Removes filters from a table or column for calculations. VALUES : Returns a one-column table of unique values from a column. TIMEINTELLIGENCE : Functions like SAMEPERIODLASTYEAR can be complex to implement correctly. CONCATENATEX : Combines text values from a column into a single string with a specified delimiter.