Chapter 13: Relationships
As you’ve worked through the construction of the Internet Joke Database website, you’ve had opportunities to explore most aspects of Structured Query Language (SQL). From the basic form of a CREATE TABLE query to the two syntaxes of INSERT queries, you probably know many of these commands by heart now.
In Chapter 5, I showed you how to perform basic JOINs using SQL to fetch data from more than one table at a time. A lot of the time, you’ll come across situations where you want to do this—for example, finding information about an author as well as all the jokes they’ve posted, or finding a category and all the jokes that reside inside it.
SQL JOIN is one of many solutions to this problem. Although there are performance ...
Get PHP & MySQL: Novice to Ninja, 6th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
