5.13 lookup value in power bi dax Power BI DAX (Data Analysis Expressions) is a formula language used to define calculations and queries in Power BI. To look up a value in Power BI DAX, you can use the LOOKUPVALUE function. This function takes three arguments: the value to look up, the column to look up the value in, and the column to return the value from. For example, if you wanted to look up the value "John" in the column "Name" and return the value