May 2002
Beginner
408 pages
9h 10m
English
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Database Relationships and Constraints
Before discussing how to create data relations inside a DataSet, it makes sense to explain how relationships function inside a relational database system such as Microsoft SQL Server. If you are already familiar with relational databases, you might want to skip ahead to the section entitled “The DataRelation Object.”
Relationships
Suppose you have to store information about customer orders inside a database. You might choose to use a database schema like the one shown in the database diagram in Figure 4.1. There are five tables in this diagram, and they are all related to the main Orders table. Notice the lines connecting the tables together. Each of these lines represents a relationship in the database. ...
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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.