September 2002
Intermediate to advanced
544 pages
13h 6m
English
Content preview from Sams Teach Yourself CGI in 24 Hours, Second Edition
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Database Design
As you can tell by now, the relational model is completely centered around tables. All data in a database is stored in tables, and all queries receive their results in tables. Therefore, when you’re thinking about how to organize your data, it’s important to think about how to group your data within tables. Here are some important rules that apply:
All data must be returned by the database in a tabular format.
Each field must contain a single value.
For the purposes of data integrity, every row must contain a value (or group of values) that uniquely identifies that row.
A relationship between two tables is represented by part or all of the data in a column. In other words, the column data that expresses a relationship must appear ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.