May 2002
Beginner
408 pages
9h 10m
English
Content preview from Sams Teach Yourself ADO.NET in 24 Hours
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Hour 4
Quiz Answers
| 1: | If a relationship is created between two tables, what values are permitted in the foreign key column? |
| A1: | The foreign key column may only contain values from the primary key column of the parent table. In other words, if the CustomerID column of a customer table and order table are the primary and foreign key respectively, the CustomerID column of the order table may only contain values from the CustomerID column of the customer table. |
| 2: | What happens if I attempt to delete a record from a parent table with dependent rows in a child table? |
| A2: | This depends entirely on your data source. In most cases, you will get an error message telling you not to delete a parent object without first deleting its children. Microsoft SQL Server ... |
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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.