Sets are the custom fields in the tableau based on some condition .Set always contains some part of data field or subset of the data.If we create a set tableau automatically creates a new field and it will store that new field separately in the sets tab of the data window.
Types of sets:
In tableau we are having two types of sets.
1.constant set
2.computed set
Constant set:
In constant set data is always constant .It will never get change.Site with out a condition are known as constant set.
computed set:
Set with a condition is known as dynamic set or computed set.data in the computed set will change dynamically based on some condition.Combining set:
In tableau we can combine two sets in to a single set in 4 different ways.
1.By displaying all the numbers from both sets.
2.By displaying only the common numbers from both the sets.
3.By displaying only the numbers who are the part of the first list.
4.By displaying only the numbers who are the part of second set.
Note:
If you want combine to sets in the tableau the rules is two sets should based on the same dimension.