Skip to Main Content
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

The INNER JOIN

The SQL Standard defines several ways to perform a JOIN, the most common of which is the INNER JOIN. Imagine for a moment that you’re linking students and the classes for which they registered. You might have some students who have been accepted to attend the school but have not yet registered for any classes, and you might also have some classes that are on the schedule but do not yet have any students registered.

An INNER JOIN between the Students table and the Classes table returns rows in the Students table linked with the related rows in the Classes table (via the Student_Schedules table)—but it returns neither students who have not yet registered for any classes nor any classes for which no student is registered. An INNER ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

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

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

John Viescas, Michael J. Hernandez
Effective SQL: 61 Specific Ways to Write Better SQL, First Edition

Effective SQL: 61 Specific Ways to Write Better SQL, First Edition

John L. Viescas, Douglas J. Steele, Ben G. Clothier
SQL for Data Analytics

SQL for Data Analytics

Upom Malik, Matt Goldwasser, Benjamin Johnston

Publisher Resources

ISBN: 9780321444431Purchase book