[References:, Tableau Help: DATENAME Function, Tableau Help: Date Functions, , To add a column that shows the day of the week for each row, you should complete the formula as follows:, DATENAME, (, ‘weekday’, , [Order Date]),  The DATENAME function in Tableau returns the name of a specified part of a date or datetime value, such as the year, month, or day. It takes two arguments: the date part and the date. In this question, you want to return the name of the weekday, such as Monday, Tuesday, or Wednesday, for each order date. Therefore, you need to use ‘weekday’ as the date part and [Order Date] as the date. The formula will return a string value that represents the name of the weekday for each order date., References:, Tableau Help: DATENAME Function, Tableau Help: Date Functions, , ]