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SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, Second Edition by Michael J. Hernandez, John L. Viescas

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Intersection

No, it’s not your local street corner. An intersection of two sets contains the common elements of two sets. Let’s first take a look at an intersection from the pure perspective of set theory and then see how you can use an intersection to solve business problems.

Intersection in Set Theory

An intersection is a very powerful mathematical tool often used by scientists and engineers. As a scientist, you might be interested in finding common points between two sets of chemical or physical sample data. For example, a pharmaceutical research chemist might have two compounds that seem to provide a certain beneficial effect. Finding the commonality (the intersection) between the two compounds might help discover what it is that makes ...

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