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SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, Second Edition
book

SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, Second Edition

by John L. Viescas, Michael J. Hernandez
September 2007
Intermediate to advanced content levelIntermediate to advanced
672 pages
13h 23m
English
Addison-Wesley Professional
Content preview from SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, Second Edition

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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Publisher Resources

ISBN: 9780321444431Purchase book