Tableau: Set a filter with one value always selected and let user to choose others?

Question

I want to create a table with a filter for use to select and compare things:

Say I have a variable Var, containing values A, B, C, D, E. I want to have a filter so that an user can select one of A B C D, meanwhile E is always selected. So the selected one and the fixed E can be display in one single table.

What is the best approach to achieve this (I checked other posts and they seem not working)?

Answer 1

One easy solution if the choices for your variable are relatively stable is as follows:

1. Create a parameter called say, Chosen_Var, containing the values that you want the user to choose between (i.e. A, B, C, D). Parameters can hold a single value.
2. Create a calculated field called say, Var_Desired, to distinguish whether an individual data row meets your filter criteria [Var] = "E" or [Var] = [Chosen_Var]
3. Place that field, [Var_Desired], on the filter shelf and select only the True value
4. Show your parameter control and configure as desired

This will allow users to select one of the values A, B, C or D, and then filter to only include data where [Var] = the fixed value E or the value the user selected.

If the set of legal values changes frequently, so that using a static list of parameter values is difficult, or if you want the user to be able to select multiple values, you'll need another solution.