What is the effect of using the operator "-" in Qlik Sense?

In Qlik Sense, using the operator "-" (minus) performs a specific function related to set operations. When applied, it returns a set of records that belong to the first operand but not to the second operand. This means that if you have two datasets (let's call them Set A and Set B), using the operator "-" will yield only those records that are exclusive to Set A.

For example, if Set A represents a list of customers who made purchases this month, and Set B represents customers who made returns this month, applying Set A - Set B will give you the customers who made purchases but did not return anything. This is particularly useful for analyzing unique records in one dataset that are not present in another, effectively allowing for comparative analysis and insights into differences between two sets of data.

This operator thus serves an essential role in data manipulation and analysis in Qlik Sense, providing clarity on specific data segments.