UPPER DAX Function
The UPPER function converts a text string to all uppercase letters.
DAX Syntax UPPER (text)
The function parameter text specifies the text we want converted to uppercase, or a reference to a column that contains text.
Example: Create a calculated column. The following formula converts the string in the column, [Country], to all uppercase. Non-alphabetic characters are not affected.
DAX
Uppercase name = UPPER(Sheet1[Country])