May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Understanding table relationships
As we covered in Chapter 1, Introduction to Relational Database Management Systems, relational databases contain tables that are related to one another. Once you need to query more than one table, you can rely on these relationships to join the tables together. There are three types of table relationships: one-to-one, one-to-many, and many-to-many. First, let's go over how to display these relationships in a diagram.
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