Chapter 1. Database Design
THIS CHAPTER DISCUSSES THE DDL (Data Definition Language), which is used to create a database schema. It is related to the next chapter on the theory of database normalization. Most bad queries start with a bad schema. To get data out of the bad schema, you have to write convoluted code, and you are never sure if it did what it was meant to do.
One of the major advantages of databases, relational and otherwise, was that the data could be shared among programs so that an enterprise could use one trusted source for information. Once the data was separated from the programs, we could build tools to maintain, back up, and validate the data in one place, without worrying about hundreds or even thousands of application programs ...
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