Tableau 中的转义详细级别表达式

Question

I'm trying to build a calculation that takes their values from a Parameter. The paramater is feeded from a string dimension.

Using SuperStore as an example, I've created a Parameter called Country Par containing all the Country/Region values.

For example, let's assume I have as a page filter Country/Region = France and the value for the Country Par = United Kingdom . Also, Month(Order Date) for Columns and Measure Values for Rows.

The measure values selected will be:

• SUM(Sales)
• SUM(Comparable Country Sales)

What I'm trying to achieve with the calculation is to retrive the values selected from the Parameter - in this case United Kingdom - ignoring whatever is selected as page filter. (France in the example).

And the same time I want to filter the Sales for United Kingdom ending the same month as Finland.

But due to the FIXED context, seems like LOD is not able to pickup the last month of Finland - Oct 2019.

Comparable Country Sales

{fixed MONTH([Order Date]):
sum(
if [Country/Region]=[Country Par]
and month([Order Date]) <= {max(if [Country/Region]="Finland" then month([Order Date]) end)}
then [Sales]

else null
END)}

This is only a representation of what I want to achieve in my original datasets, for obvious reasons I can't share the data.

Answer 1

A few suggestions here-

• Create another parameter for selection of different country instead of hardcoding it.
• Despite your requirement of calculation on month-wise sales/measure, do not extract month([order date]) in conditional statement because it will return only a numeric value. Check for date instead and later-on aggregate these month-wise if required.

I have proceeded like this..

( Note: In superstore data, I have played around on State field instead on Country as in latest version only US data is available)

desired calculated field with calculation as

{fixed DATETRUNC('month', [Order Date]):
sum(
if [State]= [Par1]
and ([Order Date]) <= {max(if [State] = [Par2] then ([Order Date]) end)}
then [Sales]
else null
END)}

See this works in my case

Good Luck