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Summary
In this chapter, I explained the fundamentals of good database design,and we learned how MySQL and, for that matter, all relational database management
systems, provide support for the representation of different types of relationships
between entities. From your meagre understanding of one-to-one relationships,
you should now have expanded your knowledge to include many-to-one, one-to-many,
and many-to-many relationships. And in the process, you learned a few new
features of common SQL commands. In particular, you learned how to use a SELECT to
join data spread between multiple tables into a single set of results. In "A Content Management System", you'll use all the knowledge you have
gained so far, plus a few new tricks, to build a basic content management
system in PHP. The aim of such a system is to provide a customized, secure,
Web-based interface that manages the contents of the database, instead of
requiring you to type everything in by hand on the MySQL command line.
