Pulling Data from Multiple Tables
As I explained in Chapter 11, one of the major strengths of a relational database is the ability to link data in different tables by using the primary key from one table as a foreign key in another table. The phpsols database has two tables: images and blog. It’s time to add some more and join them, so that you can assign categories to blog entries and associate images with individual articles.
You don’t physically join multiple tables, but rather do so through SQL. Often, you can join tables by identifying a direct relationship between primary and foreign keys. In some cases, though, the relationship ...
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