September 2013
Intermediate to advanced
350 pages
9h 38m
English
Content preview from Practical Programming, 2nd Edition
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Using Joins to Combine Tables
When designing a database, it often makes sense to divide data between two or more tables. For example, if we are maintaining a database of patient records, we would probably want at least four tables: one for the patient’s personal information (such as name and date of birth), a second to keep track of appointments, a third for information about the doctors who are treating the patient, and a fourth for information about the hospitals or clinics those doctors work at.
We could store all of this in one table, but then a lot of information would be needlessly duplicated:
If we divide information between tables, ...
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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.