Parameters are a particular element in Tableau, as with Dimensions, Measures, and Sets. They can be Continuous or Discrete depending on the data type in use. The three major aspects of Parameters are:
- They are not linked to the Data Source (they don't rely on any field)
- They only return one value at a time
- They are, by default, static, so there is no built-in way to refresh the values automatically
For the last point, you can use external Extensions, to create dynamic Parameters.
Let's start with how to create a Parameter.